Probably the data is off, try going to Settings, More, Mobile Network, and check the Data Enable box. If you still can't get internet by enabling data, then your APN must be off. If you are still with T-Mobile, then go to Settings, More, Mobile Network, Access Point Names or APN. From here you can see which Access Point is check, troubleshoot by checking one of T-Mobile's APN and trying to use the internet without Wi-Fi.
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