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It may be useful to change the PIN code of a newly purchased iPhone (if the PIN is set to 0000 by default for example) or for safety reasons to protect from fraudulent use of your phone in case of ...

At some point in time, you may need to know your iPhone’s serial number and SIM number. And if you don’t have your own phone number memorized, well, it goes without saying that you’ll need to look ...

You'll need your AT&T Wireless transfer PIN to keep your old number when switching from AT&T to another carrier. You don't need this number when you change your phone number with AT&T. This guide ...