I have no service on my I phone 8. Is this a phone issue or a carrier issue?

Read the article:

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

- "Find out what to do if you see "No service" or "Searching" in the status bar. You might not be able to make or receive calls on your iPhone if you have certain settings turned on, if your software isn't up to date, or if there's a problem with your network."

'If you see No Service, Searching, or SOS on your iPhone or iPad' click here --> If you see No Service, Searching, or SOS on your iPhone or iPad - Apple Support

Kyle ~ Does your iPhone 8 still have its original battery?

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

Settings > Battery > Battery Health

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