The remaining minutes on a T-Mobile plan can be checked by keying #MIN#, or #646#, on the phone, and pressing the call button. If a user owns a prepaid account, the remaining minutes can be checked by entering #999# and sending the call.
T-Mobile customers are automatically informed through a systems alert if 80 percent of their minute, message or data usage is consumed. Once the usage reaches 100 percent, the customer receives another notification.
Subscribers can also check their remaining minutes by logging into the My T-Mobile website and clicking Usage to view the details. The Minutes column displays how many minutes are used by each line on the account under the Summary by User header.