Cellular Data
So how do I fix it if my phone says it’s updated, but my cellular data still doesn’t work?
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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
Manually update your carrier settings on your iPhone or iPad
https://support.apple.com/en-us/HT201270
If it still doesn't work, read the article: If you see 'invalid SIM' or 'no SIM' on your iPhone or iPad