T vs 1SIM IoT
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
T
This app allows T-Mobile customers to use their phone number across multiple devices, including smartphones, tablets, and computers. It enables managing calls, texts, and voicemails from various devices, and supports using multiple numbers on a single device or one number across many.
- Use phone number on multiple devices
- Make and receive calls
- Send and receive text messages
- Check voicemail
- Manage multiple numbers
- Separate work and personal lines
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T-Mobile DIGITS is an application that gives T-Mobile customers the power to leverage your phone number on all your devices, including smartphone, tablet, laptop and desktop computers, plus wearable devices. DIGITS empowers T-Mobile customers to utilize up to five phone numbers on a single device or multiple devices all with the same number so that you can receive calls from work, home, and more, all in one place. DIGITS is ideal for: • Small businesses – keep work and personal separate, plus share your work line • Home phone replacement – contact all family members anytime, anywhere • Teams & clubs – Contact your coaches, leaders, and teammates at the touch of a button • Privacy shield – use for online shopping or social apps Use DIGITS to: • Make and receive voice calls • Send and receive text messages • Check voicemail • See missed calls
1SIM IoT
Manage your IoT/M2M devices remotely with real-time data on usage, connectivity, and spending limits. This app provides essential control over your SIM cards and devices, ensuring efficient management for various applications like asset tracking and smart homes.
- Real-time device status
- Data and SMS usage tracking
- Set monthly spending limits
- Block/unblock mobile data
- Two-way device communication
- Account access controls
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The new OneSimCard IoT-M2M app enables you to get access to the most important functions of the OneSimCard OSCAR management platform virtually anywhere you have connectivity on your mobile device or tablet. Whether your solution is for GPS (asset tracking, fleet management, people tracking, etc.), wearables, Smart meters/Smart City, Smart Home or any other Internet of Things/Machine to Machine application, the OSCAR (OneSimCard Account Resource) app allows you to easily manage all of your mobile IoT/M2M devices. The OSCAR IOT app provides you with real time information about all active, blocked or deactivated devices, network registration/connectivity status, and the current data and SMS use records. It also allows you to reconnect the device to the network if required, as well as 2-way communication to the device using Portal SMS option, which keeps logs of all sent commands to, and replies from, the device including the APN settings. The app allows you to have access to each sim card /device, set the monthly spending limit for the SIM, block/unblock mobile data, view the amount of data used in the billing cycle anywhere, anytime your mobile device is connected to the internet. The app allows for separate logins of account administrators to share or to limit various account access functions. The in-app help tools provide quick access to troubleshooting and customer support.
Screenshots
Verdict
The clearest difference is rating: 1SIM IoT at 5.0 against T's 1.5. 1SIM IoT also leads on update cadence (daily vs every 6 weeks). T's advantage is ratings volume (724 vs 1) and device support (4 vs 2). On price, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
1SIM IoT holds the better App Store score, 5.0 against 1.5. That said, the two scores are not equally well evidenced: T has 724 ratings behind it against 1, so its average is the more settled of the two.
T ships an update every 6 weeks, 1SIM IoT daily. The most recent releases landed on November 11, 2026 and November 3, 2026 respectively.
| Parameter | T | 1SIM IoT |
|---|---|---|
| Price | Free | Free |
| Rating | 1.5 (724 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 6.5% of reviews | — |
| Number of ratings | 724 — better | 1 |
| Update frequency | Every 6 weeks | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPod |
| Requires iOS | 13.0 | 13.0 |
| Further details — not scored | ||
| Size | 97 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | T-Mobile | Belmont Telecom, Inc. |
Customer experience
T
1SIM IoT
Bugs and requests
T
Reported bugs
4 issues- Login issues
- Disappearing messages
- Inconsistent call/text delivery
- Outdated/buggy app versions
Requested features
5 requests- Dark mode option
- Improved contact management
- Reliable notifications
- Seamless multi-device sync
- Better call quality
1SIM IoT
Not enough reviews yet to summarise bugs or requests.
In-app purchases
T
No in-app purchases
1SIM IoT
No in-app purchases









