I think it's actually terrible that Apple did this with the iPhone 7 regarding the different modems. It's incredibly un-Apple to make three different versions of the same phone rather then make one streamlined version that's the same in all countries. We were getting so close to this in previous iPhones and now it seems we're taking a giant step back with the crippled GSM version that not only is missing a ton of bands compared to the CDMA version, but is inferior speedwise in every single way. for instance, speed tests when connected to the SAME TOWER, in the same location, can be roughly TWICE as fast on the CDMA version then the GSM one. The Intel modem sucks and AT&T and t-mobile are far faster on the Verizon/sprint model then they are on their own GSM version of the phone. This is crazy!! I know apple got a great deal on these Intel chips, but it's certainly not worth fragmenting users on your flagship product that costs over $1000. This is beyond greedy.
The third version of course being the Japanese version that has the extra Sony subway system chips. Why isn't this the sim free version sold in the US? I go to Japan often and would love to have this ability. They even bragged about it in the Apple event. Why in the hell is this feature not even on any iPhone 7 sold in the US? Everything about them lately has seemed so misleading. I hate feeling so strongly about things like this, but I really think they made a really bad decision here to cut costs.