How can I my Verison phone to work on AT & T?

I accidentally gave a Verizon phone to my niece 10 year old, 23 years old younger than me. There is no SIM inside, and it's an iPhone 4 16 GB Black (MD276LL/A) s. I don't want to lose data, but she really wants a phone number from it uses at & T Nokia Lumia 635, I forgot the call and forced him to switch to Verizon. How to unlock and put the SIM card so that it can operate with its current number? Or I need to buy an iPhone 6?

Verizon, pushed into a bulk unlock for all iPhone 4S phones for more than a year. The phone must be unlocked. If, for some reason it isn't, your parents call Verizon and will unlock it.

Tags: iPhone

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