T-Mobile's prepaid customers with Android phones get the Refill app for easy top-ups
T-Mobile Refill is a new app the carrier recently unleashed into the Google Play Store, aiming to ease the life of its prepaid customers with Android phones.
You can view your monthly account details, schedule automatic top-ups, or make account payments. The app can also be used to send minutes and service to other prepaid users.
The app is valid for the Monthly 4G, Prepaid - Pay As You Go, and Prepaid - Pay by The Day schemes, and is a work in progress, as disclosed by its beta status
source: T-Mobile Refill (Play Store)