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Unihertz Atom, The Smallest 4G Rugged Smartphone in The World, Android 9.0 Pie Unlocked Smart Phone with 4GB RAM and 64GB ROM




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Unihertz Atom, The Smallest 4G Rugged Smartphone in The World, Android 9.0 Pie Unlocked Smart Phone with 4GB RAM and 64GB ROM

Product Description

Dimensions 96*45*18 mm

Weight 108g(with the battery)

Operating System Android 8.1

CPU Octa-Core 2.0 GHz


Battery 2000mAh

Display Size 2.45 inch

Resolution 240*432 pixels

Rear Camera 16MP AF

Front camera 8MP FF

Band support:

GSM: 850(Band5)/900(Band8)/1800(Band3)/1900(Band2) MHz

WCDMA: Band 1/2/4/5/8


LTE: FDD Band 1/2/3/4/5/7/8/12/13/17/18/19/20/25/26/28A/28B

TDD Band 34/38/39/40/41

C2K: BC0,BC1

SIM Card Dual Nano SIM

Wi-Fi 802.11 a/b/g/n 2.4GHz/5GHz, Support Wi-Fi Direct, Wi-Fi Hotspot

Bluetooth Bluetooth 4.2

Support GPS with A-GPS, GLONASS

SensorFingerprint(front-mounted), G-Sensor, Compass, Gyroscope, Proximity,

Ambient Light Sensor, Compass

Support NFC

Support USB OTG

Support 3.5mm headphone Jack

Support FM Radio

USB Type C

IP68 water proof

Do not support Micro SD card




Unihertz Atom has undergone stringent IP68 tests for protecting against vibration, shock, extreme temperatures, dust, and water

The Fingerprint scanner and Face ID provide more security for your phone and make it fast and easy to unlock the screen to take important calls or capture a memorable moment with one of Atom’s high-quality cameras.

Atom supports working on the network of T-Mobile, AT&T and Verizon in US.

If you have issues to activate your SIM card in Verizon, please try to activate it with another Verizon-certified phone first, then transfer the SIM card to the Atom.





Wanna a shortcut button for your favorite functions? Not a problem with Atom`s programmable key. Taking photos, setting alarm, opening App, or any function you`d like to open in a simple tap.

Atom’s convenient NFC features allow you to instantly make payments on the go at thousands of retailers and online stores.

Equipped with GPS+GLONASS, you can easily locate yourself in the map. Together with G-sensor, gyroscope and compass, it could be the perfect phone for your outdoor adventures, business trips and daily life.

Despite the small size of the device, inside it has a battery of 2000mAh which is sufficientfor your daily usage.

Specification: Unihertz Atom, The Smallest 4G Rugged Smartphone in The World, Android 9.0 Pie Unlocked Smart Phone with 4GB RAM and 64GB ROM

Product Dimensions

3.8 x 1.77 x 0.74 inches

Connectivity technologies

Bluetooth, Wi-Fi, USB, NFC





Form Factor


Audio Jack

3.5 mm

Other camera features

Rear, Front

Other display features




Wireless communication technologies

Bluetooth, Cellular, Wi-Fi, NFC

Item Weight

3.81 ounces


4 GB



Is Discontinued By Manufacturer


Best Sellers Rank

#20,570 in Electronics (See Top 100 in Electronics)#819 in Cell Phones

Customer Reviews

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1 Lithium Polymer batteries required. (included)



Date First Available

November 18, 2018

10 reviews for Unihertz Atom, The Smallest 4G Rugged Smartphone in The World, Android 9.0 Pie Unlocked Smart Phone with 4GB RAM and 64GB ROM

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  1. Nar

    For over two decades, my career has focused on cutting edge mobile hardware and software.So I’m as critical as they come when it comes to mobile phones.The Atom isn’t a novelty.It’s an outstanding phone.It’s rugged design it’s on par with some of the best in the market.It packs some fantastic specs too, that make it truly powerful.The screen is much better than you might expect from a phone this size.And it is a great world phone if you talk much.My only issue with the phone is all the bloatware that you cannot easily remove.Mostly Google stock stuff but also other things that are unnecessary like zello.While it is unlocked, it’s not fully opened and there is no rooting for it yet.But that’s something that most people won’t really care about.Because end of the day it is a great phone!Unihertz a while back made a very decent phone called the Jelly which was very popular.The Atom is greatly more advanced and vastly more powerful.I considered the Jelly more of a novelty, but the Atom for many can actually become your day to day phone.It’s not really for surfing the web but it can do that and really well.But if you focus on the idea of voice, this phone becomes super useful.I’m not simply talking about phone calls.I’m talking about voice recognition.Google and others have really stepped up on voice and when you hook up a decent Bluetooth headset to the Atom, you end up with a perfect tool for when you’re working out doors like cycling.Easily accessing GPS, your training app, ask to read your emails, play songs on Spotify and so much more.This isn’t your business phone.This is your everything but business phone.With the SIM tool it comes with, I easily switch between my iPhone XS Max to my Atom and vice versa.Takes five seconds to do and I prefer the Atom when I’m out I’m nature or cycling or traveling.Especially considering my $1400 iPhone is just not built for my adventures.Do if you want a truly great adventure phone, get the Atom.

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  2. James Summey

    I have been an anti-smartphone critic for years now. I stubbornly went back to the flip phone and basic phone to break my addiction of getting lost in endless YouTube videos and Amazon pages. Running a business and being a full-time student just made life rough with a flip phone, so I decided to give the ATOM a go. I immediately fell in love with the size, it literally is the size of a small flip phone folded at all times. I have had it for several weeks now and I haven’t once found myself endlessly browsing all kinds of useless web pages, just because the screen is wayy to small to comfortably do that. I’ll lay out some of my pro’s and con’s regarding my take of the phone.Pro’s:-Tiny, fits everywhere, slides in your pocket easily.-Super rugged, I’m an outdoorsy guy who loves snowboarding, biking, hiking, river trips. I would never be scared to take this little brick anywhere.-Excellent responsiveness for a phone that a lot of people may be hesitant about. My GF has the Iphone, and this thing can do just about everything the Iphone does, just in a smaller package.-Looks. It may look a little too outdoorsy and military style to some, but I really like that about it.-Camera. Some say the camera isn’t too great, but coming from a 2 megapixel flipphone, the ATOM is full of features and clarity that destroy the basic phones at least.-Battery. For a small phone the battery is really good. The style of the phone just doesn’t encourage playing games and using a bunch of screen time, so the battery will easily last all day. The lowest it has ever got on me during a full day of use (bluetoothing Spotify, using the calendar, and talking on the phone) was 51%.Cons:-Bluetooth. This is the only thing that drives me a little crazy. When I have it paired to my car stereo or headphones I have to physically push the power button on the phone to be able to change the song on the stereo or headphones. Maybe there is some setting that I am missing, I have tried to mess around with the sleep settings, but no success.-Speaker. Granted I could care less about the speaker, but some like listening to music on the tinny phone speakers. This one is on the back and it sounds like an old AM radio speaker. But, for me I don’t care, I like pairing it with my sound systems and blasting Spotify.Other than those 2 small faults this thing is absolutely badass, I highly, highly, highly recommend it if you are looking to break a smartphone addiction, or want a small rugged phone to adventure with. I also bought the clip case that goes on your belt, it works really well and fits the phone perfectly. I am looking to get the bike mount also so when the weather shapes up I can take it out on my road+mountain bike.

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  3. The Od

    Do you really NEED a big phone? You can stay connected with the Atom without becoming a tuned-out phone zombie, hypnotized by a big screen. The Atom doesn’t have an iPhone camera, but the one it has isn’t slow at all, and it takes damn good pictures. (Though they don’t look their best on the Atom’s small screen.) Apps load quickly and function very well. Sound and reception are fine. Touch screen sensitivity fades slightly near the edges, but you learn to adjust. Texting, without using the voice function, is admittedly an art; but it’s kinda fun in a challenging way. Overall, the phone is fast, reliable, and durable. Take a deep breath and look around you: there’s a whole world to see, feel, and hear. It’s bigger and more interesting than any phone will ever be.

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  4. Rural Red Panda

    I backed the Unihertz Atom on Kickstarter about 6 months ago, and I’ve been using as my main phone for the past 2 months. It has its pros and cons, but I love it. If you want a ridiculously small phone but still need it to run full Android, you’ll love the Atom too.Before I dive in to all the nitty-gritty of using this device on the daily, I’ll just say this: everyone who sees this phone for the first time really loves it. It’s absolutely hilarious, and quite the attention magnet.**Hardware**The first thing you’ll notice about Atom is its size. You’ll probably laugh when you take it out of the box—it’s that tiny. If you want to be on social media all day, need to type up emails, or want a nice screen for watching movies, stop now, because Atom’s diminutive form is not for you. However, if you want a rugged phone for the outdoors, a very very compact phone, or a phone to help you not use social media so much, this tiny one fills that niche perfectly.If you decide the tiny, low-resolution, slightly washed-out screen is for you—like I did, for a less distracting smartphone—the rest of the hardware has a lot to like. The Atom feels very well-built, and it’s IP68 water resistant, shockproof, and has Gorilla Glass 3. Couple that with how well it fits in the hand and I’m not at all worried about breaking it!It also has all the hardware features I want, and more. USB-C port, fingerprint sensor, NFC, GPS, and the all-too-rare bonuses of a headphone jack, FM radio, and customizable shortcut button. The only hardware drawbacks for me: pretty poor rear-facing speaker and cameras (more on those in a moment).You might also consider the 432 x 240 screen resolution a drawback. I don’t, because it not being eye candy only makes me use my phone less!**Performance**Unlike its lower-end predecessor Jelly, the Atom can compete with normal-size midrange phones in terms of performance just fine. It has a Helio P23 (midrange Mediatek processor) with 64GB storage/4GB RAM and stutters/lag are few and far between. Even coming from a Pixel 2, I have no complaints performance-wise. It’s actually kind of snappy!**Software**It runs almost perfectly stock Android Oreo, which is very welcome. The only additions are a handful of added apps (Toolbox with functions like compass, sound meter, and bubble level; TrackBack to plot GPS like for runs/drives; Zello for a walkie-talkie app with the shortcut button as a PTT button; a call recorder function in the Phone app), a couple extra settings (things like switch the Back and Recents button, change the shortcut button action, and enable/disable/customize the Power save manager), and a couple extra features (Face Unlock, Flip to Mute, and another battery saving mode). Other than that, it’s completely stock!It recently got its second software update, bringing a speedometer to the Toolbox, some camera and audio performance tweaks, and improved cellular performance. However, the security patch level remains May 2018. Unihertz did promise to update that soon—and the Jelly got several security patch level updates—so I’ll hold out a little hope.**Battery**It has a 2000 mAH battery, which was able to last all day for me (even with my Wear OS watch always connected!), probably because the small low-res screen means I’ve only averaged an hour per day of screen-on time (coming from ~4 hrs/day on my Pixel). I usually end a long day with about 20% battery to spare. It recharges decently fast—in just over an hour from around 20% for me with the included charger. As long as you’re not a very heavy user the battery shouldn’t be an issue.**Cameras**In good light, pictures are usable at best, but at least the camera is fast. In very specific lighting situations, I’ve actually been able to get some good shots. However, in general, especially in medium/low light, it’s a terrible camera. Some representative photos are attached to this review.Mostly, it’s great to have for scanning a QR code or document here or there. Anytime I need a good shot, I’ll need to bring along a better camera.**Real life/cellular**I’m in the US and it’s been working great on T-Mobile, including 4G LTE, VoLTE, VoWiFi, and Visual Voicemail. Calls work fine—callers say I sound crisp and I can hear them fine. Texting works, assuming you can type. Google Pay works great. It runs all the apps I need, from 1Password to Spotify to that terrible email client we have to use at school. Even my Wear OS smartwatch and bluetooth headphones paired to Atom work reliably!One important thing to know: it is _very_ hard to type. I can manage to send a quick text or two using Gboard’s swipe-to-type feature, but even that becomes a pain after a while. Pecking at the tiny screen with my fingers is even worse, as it just comes down to hoping that Gboard’s autocorrect feature will understand what I mean. For the most part, it works, because of Google’s smarts, but I wouldn’t call the experience pleasant.**Sound**The headphone jack and FM radio are big pluses for me, and Spotify and Pandora work just fine. My bluetooth headphones are great too. However, Atom’s single, rear-firing speaker is not great. It’s not terrible (I mean, it works) but it sounds increasingly tinny as I raise the volume.**Conclusion**This phone absolutely delights me, especially since I got it for a little less than the starting $260 on Kickstarter. The screen is perfectly small and already helping me not get ever lose myself in my phone. It just works and does everything I need in my phone. It’s definitely for a niche audience, and it includes me—I haven’t needed to use my Pixel once since I got the Atom set up.Seriously, this thing is perfect for me. It might be for you too, if you’re set on a really tiny, rugged phone to eliminate distractions or handle the toughest of environments.

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  5. che

    For years there have been a subset of us smartphone users who wished smartphones never merged with tablets. Who found it sad when you could no longer hold a phone with one hand and reach all of the screen with your thumb. Who enjoy outdoor adventure but feel like they have to put their huge phone into an even larger case for it to stand half a chance outside. Until now the only solution to get a smaller screen was to buy older models (Sony Xperia Compact, older iPhones, etc), frequently lacking modern specifications and features. But finally…the Atom. A phone that fits in one hand, doesn’t mind getting wet, and has virtually all features you’d expect of a modern day smart phone.Pros: – Very fast. From maps to video chats this thing doesn’t lag. – Large storage (64gb) – Great tmobile compatibility. Worked out of box with no odd configs necessary. – DUAL SIM. Not sure I’ll use it but very nice to have – Modern bluetooth, GPS, and NFC – Hardware PTT button. If you haven’t used Zello it’s pretty sick and works flawlessly on this device. – Truly doesn’t seem to care about getting wet. I wouldn’t purposely swim in a pool with it but in the rain the touchscreen just keeps on working like it’s nothing. – Headphone jack! – Wifi calling/VoLTE (at least on tmobile works out of the box) – Very accurate/responsive touchscreen (critical because of how small it is) – Very good battery life. 1 to 2 full days of use between charges. – USB-C – Sub $300. Could you ask for anything more?!Cons: – Charging is slow – No wireless charging (although that is always slow on any phone so I never have cared to use it) – The cameras are adequate. Perfectly adequate but not at all excellent. – Android 8.1 instead of 9 (but manufacturer has promised 9 update is coming) – It is undoubtedly tougher to type on than a full size phone, although not quite as bad as I expected. Voice recognition/glide/swype input is your savior here. – The screen protector included in the box is ugly and low quality – The included wrist strap is similarly ugly – The screen could have better color depth/contrast. Not noticeable when doing regular content but can be seen on video or when someone sends you a photo from a nicer camera.The thing is built like a tank and has done everything I’ve asked it to. Every app I use works on the thing without issue, from slack to email to duo video chat to weather underground and beyond. For the price this is a no brainer. Loving it.

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  6. John S

    I wanted a cool toy! I’m 55 and love this stuff! This phone works perfectly. It does everything. It’s a mid range phone, that’s tiny. Real tiny. I have to wear cheaters to run it, except calls. You can’t text for crap. You have to talk text. Even a stylist is too big! It’s fun. It breaks the ice in conversations. Everyone is amazed. Don’t buy it for the camera. Or anything that you need a larger screen. It’s rugged, it’s a chunk. It’s bullet proof. Calls are amazing! Remember to turn the volume down. I bought a watch for music at the gym. Pain in the butt to load. This I throw in my shorts pocket and sweat and have no worries because it’s waterproof. And you don’t need a phone protector. It’s a beast just the way it is. It comes with a screen protector. Which is fine. But it’s gorilla glass. And the screen protector was unnecessary. I thought when I bought it, I’d check it out and return it. But I’m keeping it. It does everything you would expect! Scored a 90,000 on antu benchmark. So it’s fast enough. When I need my larger phone, I just slide out my prepay SIM from Verizon and it starts right up. Also, bought because I ride motorcycles, and rain used to be a concern, no more! And talk quality is perfect. I bought this from Amazon and I am an average Joe customer. Have some fun! Buy one.

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  7. Zuelspeed

    First and foremost, anyone considering this phone must be a fan of small form factor phones. It is very small. The pictures on the manufacturers website and Amazon make it look larger than it is. I highly recommend going onto the manufacturer’s website, noting the dimensions, then getting a metric ruler and drawing it’s size on a piece of paper.Personally, I am a fan of small form factor phones. For years I used a first generation iPhone SE, but still considered that phone to be marginally too big. When my company issued me a Galaxy S10 for work related calls I found myself carrying around my SE as well as the S10. So now I was carrying around 2 phones, and honestly, the S10 felt like I was carrying a full-sized tablet in my pocket. I needed a small form factor phone that was rugged, affordable, and dual SIM. I found exactly that in the Unihertz Atom. I utilize both SIM positions, so I have my personal calls and work calls with 2 different numbers coming to one phone that is literally half the size of the Galaxy S10. I love this phone.Warnings: If you have large fingers, poor dexterity, or bad eyesight, forget about it.All that being said, if you’re looking for a small form factor phone that is tough and has great features, this may be your baby. If you’re a slave to social media and stare at your phone all day then you may want to go with something larger.

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  8. Scott

    I’ve been looking for a smartphone that isn’t massive like all the mainstream behemoths. This is the best one I can find so far. To be honest, it’s not my ideal phone, but it’s close. I have the Jelly pro, and would stick with that, but the battery life on that phone is abysmal. It’s great to be able to swap it easily, but if I’m swapping because it doesn’t last more than a few hours, that’s no good. The Atom has more than double the capacity, and that’s enough. I’d still like to be able to swap the battery out easily, but I understand that the Atom is designed as a rugged/waterproof phone, so it makes sense that you can’t.Battery life is good, it lasted all day for me YMMV. Compared to the Jelly pro, this phone is pretty thick and heavy. I assume a fair amount of that space and weight is due to the larger battery.It would be amazing if the screen took up nearly all the face of the device like mainstream trends, but that’s a compromise I’m willing to live with. I love how small it is, but I’d actually prefer a slightly larger screen.The precision of the touch interface is incredible for a screen this size. I have large fingers, and I rarely select something I’m not aiming for. The only problem I’ve found with the screen size and touch precision is when using a swype style keyboard, it just doesn’t have enough room to read the swipes accurately. If I type out letters individually it has no problems with accuracy. Considering the fact that half a dozen keys fall under my finger when I type, I’m blown away with it’s ability to know what I’m going for.Since it’s so small I turned on the “play all audio as mono”, and it works just fine. I didn’t see the point of stereo audio when the speakers are only inches apart. It is loud enough that I can use it as an alarm.Bluetooth has connected perfectly anytime I’ve used it thus far. I’ve had no random disconnects or any other issues whatsoever.My Project Fi sim card worked without any trouble, but it reads it as T-Mobile only.Wish it had an SD card slot, but with 64gb of internal storage, this isn’t a big deal.The camera is usable quality, but I’ve only taken two pictures so far, so I can’t really judge. One photo was the standard 16mp 4:3 without HDR, the other was 8mp 4:3 with HDR. The HDR was clearer/better. I don’t take a lot of pictures anyway, so I’m not the greatest to rate quality.The fingerprint reader doesn’t pick up my finger every time, but does at least 50% of the time. I think it’s more because you can only have it recognize a small part of your print due to it’s small size. To help with this, I put in my thumb print as separate prints, just from different angles.The processor and RAM are certainly enough. I haven’t had it freeze or lag on me yet. I don’t game, and wouldn’t suggest gaming on such a small device, but it works well for video, browsing reddit etc.Altogether, a great phone, and I hope Unihertz keeps up the good work. I’ll definitely be looking for their latest model the next time I am looking to upgrade. No phone is perfect, but this one comes pretty close.

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  9. Chris

    I really enjoy this phone as it can do everything that a regular size phone can. The biggest benefit to me is it’s small size and it’s rugged durability. At times it can be hard to text or send an email but in portrait view it’s very doable. If I find myself writing a long email on my phone I’ll simply hit the microphone button for speech to text recognition. I’ve had absolutely no issues with this phone and it is the best phone I have ever owned. It is a welcomed experience to no longer have a large brick of a cell phone in my pocket when I go about my day. The camera is excellent for my standards (16 megapixels), the battery easily lasts all day, and the software is extremely quick and responsive. Also, unlike many other phones there are hardly any factory installed apps on the phone that you can’t delete. The amount of memory on this phone is more than adequate. I use this phone as a GPS like anyone else would with their smartphone and the GPS is outstanding as well. YouTube Works excellent and the low screen resolution is not a big deal because the screen is so small that it still is Crystal clear despite the low resolution. I use this as my primary phone day in and day out, and when comparing it to my other large phones in the past, I can’t think of one single thing I can no longer do by going to this smaller phone. For what it’s worth, I wrote this review on my unihertz Atom phone. I will probably never go back to a normal size phone again 🙂

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  10. Fox

    I’ve been a devout iPhone user since iPhone 4. I absolutely love the Unihertz Atom. I love how compact and rugged it is. It feels very well built. The quality is top notch. Side-by-side, it was faster than my iPhone X loading apps and webpages. First thing my wife said to me when I called her is how much clearer I sounded on the Atom as opposed to my iPhone X.It runs Instagram, Facebook, Nest, Snapchat and many more apps perfectly. I have mine activated on Verizon’s prepaid network. After activation, I had to put the SIM card in my iPhone X and back out again to get it to fully activate to use MMS messages. This only seems to be an uncommon occurrence depending on the network you choose, but it’s an easy fix. Verizon tech support was zero help and after an hour, I was told the Atom wasn’t compatible on their network even though I had 4G, could surf the web, make calls/text. If you want real support for the Unihertz Atom, there’s a subreddit dedicated to it and members are fast to help.I don’t find typing to be that difficult on it. After a little usage, you become accustomed to typing on it. Swipe typing is actually very useful. The camera really isn’t as bad as many make it out to be. It’s very capable and no one I’ve sent pictures to thinks the quality is bad. The speaker on the phone also isn’t bad at all. It’s plenty loud and I’ve watched YouTube, Netflix and Hulu on it with no issue. Sound is very clear at any volume.

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    Unihertz Atom, The Smallest 4G Rugged Smartphone in The World, Android 9.0 Pie Unlocked Smart Phone with 4GB RAM and 64GB ROM
    Unihertz Atom, The Smallest 4G Rugged Smartphone in The World, Android 9.0 Pie Unlocked Smart Phone with 4GB RAM and 64GB ROM


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