How to turn an Verizon phone (iPhone) into an At&t phone?

Do I have to go to the At&t store and ask them to turn this verizon iphone into an At&t phone? Or what else?

The Verizon iPhone will need to be unlocked. You must ask Verizon if your iPhone is unlocked before contacting AT&T. Also, the phone must be an iPhone 4S or newer. IPhone 5 on Verizon will not necessarily support AT&T's network standards (such as LTE)

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