USIMS Review: Free 1GB, Global eSIM and Free Low-Speed Data

USIMS is a travel data eSIM service that lets you purchase mobile data for different destinations through the same application. It is not a traditional local SIM phone plan and does not provide a regular mobile phone number for voice calls or SMS; when travelling, you can keep your existing SIM to receive calls and verification text messages.

Your phone must be unlocked and support eSIM. USIMS says you can check compatibility in the application; do not rely solely on promotional information for your phone model. Check using your own device before purchasing.

The USIMS FAQ and application page promote 1GB of free data for the United States and Europe, with no purchase required. The App Store listing has also recently added Free Essentials Forever: low-speed data for messaging, maps, banking and travel applications, covering more than 200 destinations. These two services differ in their supported applications, speeds, destinations and how to claim them.

Official information does not clearly explain the activation deadline or validity period for the 1GB trial, or whether the European destination list includes the United Kingdom. Before departure, open the application and confirm each item: the destination, whether the trial has been activated and the remaining validity time.

Hong Kong is listed as a paid destination in the USIMS plan catalogue. At the time of checking, one example was a Hong Kong 1GB plan valid for 10 days at €20; this was just one plan in the application/API catalogue at that time, and prices and available durations can change. Before paying, refer to the currency, data allowance, duration and network displayed in the application.

Do not apply per-GB prices from other brands, countries or promotional periods to Hong Kong. First estimate the data needed for your trip, and check whether the plan's validity starts on the activation date and whether it can be topped up or renewed.

The invitation route listed on this page is a USIMS invitation link. The official FAQ and store pages support the availability of 1GB of free data for new users in the United States and Europe, but current official materials have not confirmed whether the invitation link adds an extra US$3, nor clearly explained the relationship between the invitation code and the standard free trial. Do not treat the unverified US$3 as an available balance.

After opening an account, check the application's rewards or wallet page to see whether the 1GB trial appears, and verify its destinations and expiry date. If you cannot see the offer, ask USIMS customer support before purchasing any plan.

Install the application on your phone through the invitation link on this page, receive a login password through your phone number or WhatsApp, then follow the application's instructions to install the eSIM. Connect to stable Wi-Fi during installation and avoid leaving the initial setup until you are travelling.

Installing the eSIM and starting to use data may happen at different times. Official USIMS pages have not explicitly confirmed when the free 1GB activates or expires; before departure, check the activation status displayed in the application and confirm your roaming and mobile data settings.

USIMS plans provide data services. Unless your existing SIM or another application provides a separate service, USIMS itself will not give you a regular voice-call phone number or SMS. If you need bank verification codes while travelling, keep your existing SIM and check the roaming settings for your primary network.

Plan coverage, partner networks and speeds vary by destination. Even if the plan name is the same, check whether the country you are visiting is covered by that plan, and prepare Wi-Fi access or a backup internet option.

Suitable for: people whose phones support eSIM, whose departure location is within USIMS coverage, and who can clearly see the free data conditions or paid plans in the application. If Free Essentials covers the maps and communication applications you regularly use, it may serve as a low-speed backup; do not treat it as full high-speed data.

Not suitable for: people who need a local phone number, whose phones are locked or do not support eSIM, who require guaranteed high-speed data, or who have not yet confirmed the destinations and free data time limits.