T-Mobile is today expanding its support for eSIM technology and offering digital SIM card technology for its post-paid plans, in addition to the prepaid options it has supported since last December.
Unlike the prepaid options, which, however, can be purchased and configured via an app, converting a post-paid SIM to an eSIM requires a visit to a T-Mobile store or contacting T-Mobile customer support. After you set up your account with an active eSIM, you can download it to a new device by following the instructions in the T-Mobile support document here.
Why would a T-Mobile customer want to do this? Moving your most important post-paid subscription to an eSIM means that you can use a second mobile subscription from a physical SIM card at the same time. This means, for example, that you can purchase a second, local SIM card to access data while traveling, or use your work and home phone number from one device. The disadvantage? You lose the flexibility of quickly and easily interchangeable devices, one of the best benefits of standardized universal SIM card technology.
So far, only the iPhone XS, XS Max and XR work with the eSIM configuration from T-Mobile, although presumably Apple & # 39; s upcoming iPhone 11 setup also supports this. But that is still a fairly limited list of devices. As with all Apple eSIM settings, there are also some limitations: you can use both active numbers for voice calls and text messages, but only one data network at a time.