Pros
- Great international call rates!
- You don't have to sign any stupid long-term contract
- eSIM activation is super smooth!
- The interface is clean and silly
- The customer service responded quickly!
4.3 Tools 1.2.54 0.10M





Ultra Mobile is a prepaid operator in the United States. It runs on TMobile's network, and its supporting APP is simply the "big steward" of your account. Imagine having a customer service boy in your pocket who never rests, always helping you with everything. This APP was hand-built by Ultra Mobile's own team of engineers. The core focuses on three things: checking data in real time, managing international calls, and recharging accounts. Its target users are also straightforward-travelers with limited budgets, student parties, and people who often make calls abroad for fear of being scared by bills.
The most eye-catching thing is the dashboard on the main screen. You can see at a glance how much high-speed traffic you have, how many call minutes, and how much SMS balance you have left. It will be updated almost seconds after you run out of service, without manual refreshing or guessing. I gave it a special try: after swiping YouTube for 30 seconds, the APP deducted the corresponding traffic within 10 seconds. Seriously, this is much faster than many big-name operator apps I have used! The progress bar is also color-marked (green, yellow, red), so you can see at a glance whether the speed limit is about to be limited. Although it is only a small detail, when using it daily, you no longer have to worry about "Am I overusing it?" that anxiety.
This is definitely the killer app. Unlike most prepaid carriers, Ultra Mobile's basic plan includes unlimited calls to more than 80 countries, and the APP gives you a super clean interface that lets you see which countries are listed and how many minutes have been spent. You can also buy a "World Connect" add-on package directly in the APP to unlock more destinations without having to dial a mystery code or call customer service. The call logs clearly separated domestic and international calls, and I experienced international calls with surprisingly low latency (presumably stained with TMobile's VoLTE baseband). My sister calls her little boyfriend in the UK every week. Just for this feature, she thinks Ultra Mobile is worth a try.
Ultra Mobile's APP follows the material design style, dark blue and white, clean, but not cold at all. There are four tabs in the bottom navigation bar: Home, Usage, International, and Account. Each icon is clearly marked and there are no hidden secondary menus. I stuck my phone directly to a friend who had never used a prepaid APP, and she checked the balance and recharged $10 in 90 seconds. Yes, it's the kind of UI that is so simple that you feel like you're not fighting with the software, but that it's listening to you. The animation is smooth, even on a low-end Android machine that has been used for three years, it is not stuck, and pages are loaded comfortably quickly. The only minor flaw is that you have to enter a password when logging in on a new device for the first time (the initial login interface does not support fingerprints or faces), but it will remember you as long as you go in once.
Compare Ultra Mobile's apps with Mint Mobile, Visible or TMobile Prepaid apps, and it is better in two things:the accuracy of core functions andthe simplicity of the interface. The international calling options of many competing products are deeply hidden and can only be found after three key points. They even allow you to jump outside the APP to check preferential rates. What about Ultra Mobile? The international balance is displayed directly on the "Usage" label and can be seen at a glance. I used the network-level test in my mobile phone settings to compare it. The error between the traffic displayed on the APP and the operator's background is between 1% and 2%. This accuracy is enough. As for the simplicity of the interface, this APP is particularly restrained and will not tempt you with dazzling promotional advertisements on every page. When recharging, it will clearly tell you "$20 =1 month of unlimited calls and text messages +5GB of high-speed data" without any small words. This kind of honesty really attracts good feelings.
If you are already an Ultra Mobile user, why bother? This APP is the only correct way to manage your plan. If you're thinking about a prepaid carrier to switch to, and international calls are what you need all the time, I really recommend you try Ultra Mobile. I give the APP itself 4 stars out of 5. It doesn't make any revolutionary innovations, but it just makes the most basic functions effortless. Here's a tip: Be sure to turn on push notifications that data is exhausted in your settings (it is turned off by default), so that you won't exceed your plan. In addition, don't go cheap and swipe your balance-this APP responds too quickly. You may want to click on it every hour like the first week I used it. Save your energy and do something else.
Open the Ultra Mobile app, click "Activate SIM Card", then enter the SIM card number printed on the card, and then follow the steps on the screen. Service will be available in a few minutes. Path: Ultra Mobile App > Activate SIM Card> Enter SIM Code> Confirm.
The App supports Ultra, Flex and PayGo accounts. Travel accounts are not good. If you're not sure what account type you have, check your welcome email or check your account details directly in the app. Path: Ultra Mobile App > Account> Account Type.
Just dial the international number directly on your mobile phone, and Ultra Mobile will automatically give you free calls, as long as it is a supported destination. No additional code or other apps are needed. Which countries support it? Look at the list in the app. Path: Ultra Mobile App > Account> International Features> Country List.
Of course! Each Ultra Mobile plan includes free hotspot data. Just go to your phone settings and open "Personal Hotspot" or "Mobile Hotspot", and then connect to other devices. No extra charge. Path: Mobile Settings> Personal Hotspots> Open.
Open the Ultra Mobile app and go to the home dashboard. The remaining data, call minutes and account balance will be displayed in real time. You can also see the detailed usage history. Path: Ultra Mobile App > Account> Usage and Balance.
You can make unlimited domestic calls within the United States and send unlimited text messages to any country in the world. Note that only standard text messages are included (no MMS or premium content). Path: Ultra Mobile App > Account> Plan Details> Calls and SMS.
Users generally praise Ultra Mobile for its reliable network, affordable pricing, and user-friendly interface, especially after recent app updates that resolved login issues. However, significant complaints persist across multiple dimensions. Regarding login & security, many users report frequent automatic logouts citing 'security reasons,' leading to frustration and account lockouts that even support staff cannot resolve, while some find the improved version flawless. For network & coverage, opinions are split: some enjoy good speed and connectivity, but others experience extremely slow 4G, poor indoor reception, and no data roaming outside the US (with unexplained billing drainage). Customer service receives harsh criticism: long activation times, unhelpful automated replies, and failure to process refunds or unblock accounts; a few users had smooth number transfers. Plans & billing are controversial: advertised low prices later increase, unlimited plans throttle after 2 weeks, and prepaid discounts are unaffordable for some. App functionality is mixed — while helpful for plan details, features like live chat force external browsers, and renewal/outgoing call issues are common. Overall, the app divides users sharply between satisfied customers and those switching away.
Terrible. Abysmal and money-hungry individuals.
I am using Ultra Mobile and I like it. The network is good.
Great! 👍
This SIM and plan don't work outside the US. I have 3GB data plus $5 roaming, but roaming ran out in 2 days. Without adding more money, I can't use data, make calls, or send SMS. Even with data and roaming turned off, Ultra Cellular still drains my roaming balance. I had to turn off the SIM completely to save money. Horrible!
My app is not functioning properly and fails to operate as expected.
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