That isn't necessary if all you want to do is switch SIMs.
I have AT&T and want to unlock one of my devices to use a foreign Sim card. I had issues doing this through their unlocking portal, and spoke to AT&T to get the device unlocked. I was told by a service rep that the device is unlocked and to complete the unlock process I need to back up and restore the device from iTunes. Does anyone know if this is true that I have to restore and back up on iTunes to unlock it?
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You will have to have iTunes and before you leave with your AT&T SIM in the iPhone connect to iTunes and Restore your iPhone as a NEW iPhone (not from backup, but do a backup before trying this). You will get a message that says "Congratulations, your iPhone is now unlocked." After that you only need to remove the AT&T SIM when you get to Israel and replace it with one from there that works with iPhones and activate the phone. You won't need iTunes to activate it.
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Do I need iTunes to unlock my phone from carrier