PAYMENT ARRANGEMENT SELF SERVICE STEPS

Here are the steps how you can set it up on the App. Alternatively, we can be the one to set it up for you.

Open the app. Tap Menu > BILLING & PAYMENTS. Tap Set up a Payment Arrangement. When you see the installment dates, stored card, or bank account on file tap the right arrow to change any of the arrangement details. Otherwise, tap AGREE & SUBMIT.

For your reference: https://support.t-mobile.com/docs/DOC-4060