Replace your Sprint SIM card by May 1. Shortly after T-Mobile acquired Sprint in 2020, the carrier discontinued the Sprint brand. Since that day, there haven’t been any new Sprint customers, ...

Without the SIM card in place, your phone wouldn’t know what network it needs to connect to, and the network wouldn’t know that the phone in your hand belongs to a subscriber.

Physical SIM Card vs. eSIM: What's the Difference and Which Do You Need? There are two ways to connect your phone to your wireless service, and each works a little differently.

Insert your SIM card into your phone while it is powered off. Turn your phone on. Follow the on-screen setup prompts. Call 1-800-T-MOBILE to complete the process.