If you look at the link below, the Verizon / t-mobile model number is listed to be A1638 - is this an error ? and it should be A1688 because such a model (A1638) is not listed on the apple website, does this mean the T-mobile iPhone will work on the verizon as well and vice versa
http://www.apple.com/iphone/LTE/
http://www.apple.com/iphone/LTE/
http://www.apple.com/iphone-6s/specs/
http://www.apple.com/iphone/LTE/
http://www.apple.com/iphone/LTE/
http://www.apple.com/iphone-6s/specs/