My iPhone has no service

No service or searching

Go through the various suggestions in the support article below but if they don't help, and your network carrier can't help, then contact Apple Support for further investigation.

Support article: If you see No Service or Searching on your iPhone or iPad - Apple Support

Hello.

If you mean no phone service, go to

Settings > Cellular > Cellular Service On

If that doesn’t work, (still assuming you have no cell service) you may be in a rural area or a area without a good cell signal. Try moving around to see if you get a signal. If the issue persists, contact your cell carrier.

Regards,

mdp1101

If you have an iPhone 7, see this article.

iPhone 7 Repair Program for "No Service" Issues - Apple Support