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My cellular network is updated but still says error
iPhone 7 Plus
If you already tried all the options in the Related Article
Manually update your carrier settings on your iPhone or iPad
then take out the SIM with the phone on and out it back.
After that call your carrier's help desk.
you can reach out to Apple Support directly. Depending on your region, you may be able to reach them here: contact Apple Support
Thank you , I tried all of that but still no help
My cellular network says error and I am updated
