Can I use someone else's upgrade? AT&T?

Okay I can't upgrade my phone until 2014. And we have a family plan. My mom and dad are able to upgrade their phones right now, I was just wondering if I can take their upgrade. I want an iPhone 4 and I'm not sure how that would work. I don't want my number to change though.

My son and I did it with Verizon. Not sure of AT&T's policy. You could just call them and ask.

Yes its called cross upgrade

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