Adding a line to your account is easy. Let us show you how.
Only the Primary Account Holder can add lines to an account. The account must be current.
T-Mobile app (2018)
Scroll to and tap Add a line.
Follow the on-screen instructions.
- Open the app. If you don't have it, download it now.
- Tap Menu > Shop.
- Scroll to and tap Add A Line and follow on-screen instructions.
- Open your My T-Mobile account and click Shop.
- Scroll to and click Add A Line and follow on-screen instructions.