Why doesn’t my SIM card work if it’s in my iPhone?
Why doesn’t my SIM card work if it’s in my phone?
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See this Apple articles below:
How to unlock your iPhone for use with a different carrier
https://support.apple.com/en-us/HT201328
Manually update your carrier settings on your iPhone or iPad
https://support.apple.com/en-us/HT201270
Set up cellular service on iPhone
https://support.apple.com/en-gb/guide/iphone/iph3f11fba92/ios
If it still doesn't work, read the articles below:
If you see 'invalid SIM' or 'no SIM' on your iPhone or iPad