Good thing T-Mobile made a commitment to keep their 1900mhz GSM working through at least 2020. (UMTS might actually sunset first) Source: https://newsroom.t-m

Good thing T-Mobile made a commitment to keep their 1900mhz GSM working through at least 2020. (UMTS might actually sunset first) Source: https://newsroom.t-mobile.com/news-and-blogs/att-2g-iot-lifeline.htm https://newsroom.t-mobile.com/news-and-blogs/att-2g-iot-life...