Sim not valid
Everytime I install my simcard it shows sim not valid I cant figure out what is wrong with it.i guess it it is a carrier problem, help me solve this problems.
iPhone 6 Plus, iOS 12
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Did you just change carriers by any chance? If you did and you get that error then your iPhone may be locked to the carrier that it previously worked with. Give the previous carrier a call and ask them about getting your iPhone unlocked.
If you did not just change carriers and are getting that error then shut down your iPhone and start it back up again. If that does not resolve the issue then call your current carrier and ask them about error and the resolution.
Axel F.