How I change the phone number I had before adding a new SIM card
I changed my SIM card when I was in Colombia I came back home and changed it back but it’s not accepting it. What am doing wrong?
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See this Apple articles below:
Set up cellular service on iPhone
https://support.apple.com/en-gb/guide/iphone/iph3f11fba92/ios
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