A few things to check:
- what network is the phone set to (5g, 4g etc)
- 5g isn't always great so consider changing to 4g
- do you have any DNS? Usually on auto but can try turning it off briefly to see if it resolves
Hard to diagnose a possible problem at this point - this is based on the assumption that you have a data plan and a signal.
Do you have any issues with WiFi?

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