USA T-Mobile Authorized Retailer. Unlimited Domestic Calls, Texts within USA nation-wide. No international call.) Valid for 21 days upon activation. True Unlimited High-Speed Data at 4G/LTE speed on T-Mobile Network USA. Hot spot tethering supported (3G). Activation could take up to 24 hours. Please submit the request 2 days in advance.Your SIM card will be activated on your requested date scheduled (North America Central Time Zone). HUAWEI,OPPO,XIAOMI,SONY are NOT fully compatible with T-mobile service. Android phone(such as Moto、Samsung、Nokia and etc.) has to be the model released within 2 years. iPhone users have to be iPhone 8 or newer version. Standard/ Micro/ Nano all size tri-cut SIM. US Prepaid SIM for 21 Days. This product uses T-Mobile Network. Plan Details Data Unlimited 5G | 4G High-Speed Data in USA nation-wide (Hawaii is included). 5GB Data at 5G | 4G High-Speed data in Canada and Mexico. Phone Calls and Texts Unlimited Calls and Texts among United States nation-wide (Hawaii is included), CA and Mexico. Phone Number The SIM comes with a local US phone number You will get the local US number the day before your scheduled activation date. 1 Easy Step to activate your SIM card Simply fill in activation form 3 days before your departure, you will be able to enjoy the sim upon arriving with NO extra roaming fee. Device Compatibility iPhone users have to be iPhone 8 or newer version. Please Check device compatibility before purchasing. (Please go to T-Mobile website searching "bring-your-own-phone"). Special Notice Make sure your phone is UNLOCKED. SIM activation during weekends and US national holidays may be delayed.( GMT+8) The plan is refillable. This product is NOT compatible with Wifi hotspot devices, pad phones, and Carrier-Locked phones. Please note that Sim2Roam will not be responsible for any problems due to device incompatibility.