Learn how to reset the Access Point Name (APN) on your Android device. Incorrect APN settings can cause problems when trying to use data services.
Note: Before resetting your APN, uninstall any third-party task killer or battery saver apps. Some of these apps disable the APNs or data connection to conserve battery life
If above steps to reset the APN did not work, you can manually enter the APNs:
T-Mobile internet & MMS APN settings
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