Glass back replacement for the iPhone 4 and iPhone 4S available in 8 colors. Please choose the appropriate model and color below. If you have an iPhone 4 with Verizon or Sprint, you need to choose CDMA in the model type. If you have an iPhone 4 with AT&T or any other international GSM carrier, please choose iPhone 4 GSM. All iPhone 4S are dual band therefore it does not matter whether you have a Verizon, Sprint, or AT&T you just need to choose iPhone 4S.