Under the IUP, I reserved a black Verizon iPhone 7 Plus the other day, but I have AT&T. For some reason, they could not activate the iPhone on AT&T because the Serial number was registered under Verizon. The iPhone they used to scan the barcodes kept asking me to sign in with Verizon. So, unfortunately, I walked out empty handed even though it would have worked if I put my sim card in it. I was so bummed. The Verizon versions are capable with both CDMA and GSM carriers.. so I don't understand.