My iPhone 7 cannot access cellular data or make and receive calls or messages. How am I going to fix it please.

Hello ~ Any help here by clearing on the link below…

If you can't make or receive calls on your iPhone - Apple Support

Post back if you still need assistance after working through the information in above link.

~Katana-San~

This might apply:

iPhone 7 Repair Program for "No Service" IssuesAppleOfficial Apple Support › iphone-7-no-service

oladejo ~ Does your iPhone 7 still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health

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