Thank you for reaching out to us today. We'll be happy to take care of this for you. Please start by checking that cellular data is enabled. Swipe up for Control Center and make sure the cell data button has a white or green background. Black means disabled and seems to be the most frequent cause. If that doesn’t fix your problem, please go to the full guide and work through the steps there. If you require additional assistance, please let us know.
Darais, AT&T Community Specialist
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