Sim issue
I insert a sim in my phone and it was working fine but recently it keeps telling me no service but when I change the sim to a different network then it works okay please what’s the problem?
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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
See also these Apple articles below:
How to unlock your iPhone for use with a different carrier
How to unlock your iPhone for use with a different carrier - Apple Support
Manually update your carrier settings on your iPhone or iPad
Manually update your carrier settings on your iPhone or iPad - Apple Support
Update your network provider settings manually on your iPhone or iPad
Update your network provider settings manually on your iPhone or iPad – Apple Support (UK)