
Try to optimize the range of the mobile network, see this Apple article:
If you see No Service or Searching on your iPhone or iPad
If you see No Service or Searching on your iPhone or iPad - Apple Support
⤵️
Contact your carrier
Issues with your carrier or account might affect your service. Contact your carrier to:
- Verify that your account is active and in good standing.
- Make sure that there are no outages in your area.
- Check that your device isn't blocked from receiving cellular services and is set up with the right data plan.
⤵️
Get more help
If your carrier confirms that there's no issue with your account or network, but you still can't connect to a cellular network, contact Apple Support.
If you see an alert next to No Service, learn what you can do.

Charge the battery > 70%.