HT1937 I hit upgrade on my phone and now it says sim not valid on my phone.

Been having troublegetting the phone to read the sim card.

If you're getting a "SIM not valid" message, then most likely your iPhone was hacked to unlock it from the cell carrier and the upgrade has removed that hack, causing your iPhone to lock back to the original carrier. Only that original cell carrier can authorize an official, permanent unlock, so you will need to contact that carrier.
Regards.

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