T-Mobile users have the ability to check the number of text messages sent and received by dialing a code, calling the T-Mobile customer care line or logging into the T-Mobile member area online. These services are useful for customers whose text messaging plans may be limited and would like to monitor their text message usage, or to check the date and time of the last message sent or received.
Dial "#674#" on your T-Mobile phone and hit the "Send" or "Call" button. Your text message usage will appear on the screen.
Call the customer service line. Dial "611" and listen to the menu options. When prompted, say "Message Usage." The voice system will respond with the text usage information.
Register and login to your My T-Mobile account at my.tmobile.com. Click on "Manage," then select "Account Usage."