If you have persistent issues with service / connection with your Light Phone, we recommend performing an APN reset:
Head to Settings > Account & Info > Device Info > SIMs > eSIM
and check whether Noble is enabled. If it is, please continue with the
steps below.Next, go to Settings > Account & Info > Device Info > SIMs > Change
Defaults and check whether all three categories are set to "T-Mobile."
If they are, move on to the final step.Finally, navigate to Settings > Account & Info > Device Info > SIMs >
Active/Default for mobile data, calls, SMS > Access Point Names and
tap Restore Default APNs