Iphone att/sprint version difference?

I'm about to buy a replacement backpanel for my iphone 4, but how do i knoww hat version it is? I bought it unlocked from applestore

Thy are diffrent because the att is GSM and the verizon is CDMA so a att sim won't work in a berizon phone even if its unlocked

It would be the GSM model, aka the AT&T version. In the case of the iPhone 4 the dead giveaway is the SIM slot on the right side. Verizon does not use SIM cards so those models never included the slot.

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