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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 ...

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 ...

Activating a Vodafone Idea (Vi) SIM card is essential to start using voice, data, and messaging services. Whether you've purchased a new SIM, switched to an eSIM, or want to reactivate an old number, ...