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The USA version is the Icon and it is a Verizon only phone... Vzw has recently discontinued carrying it.
The other is the International 930.
They vary mainly in the onboard cellular radios, but also in Firmware to a small degree.
If you want an International 930 for use in the US the LTE radio is all wrong for ATT or T-Mo use and you will only get 3.5G (H+) data speed at best.
See these threads:
http://forums.windowscentral.com/ask-question/298203-will-nokia-lumia-930-work-t-4g-just-3g.html
http://forums.windowscentral.com/ask-question/330367-help-me-chose-new-phone-please.html
Does Lumia 930 has any difference between USA version with Other version
OMG!! Is it that bad situation in the US? I'm not from USA, but after reading your post, all I am understanding is, people can't upgrade their 920s or 925s if they are not on Verizon?? That's the worst situation for Windows Phone marketshare then, as they might lose many loyal 920 n 925 users.
It's not the case with USA only, worldwide where networks use CDMA or GSM the incompatibility exists. Nothing to get surprised. Plus there are options available on networks, but phones are network locked so moving across carriers is a bit limited. Best way is to go carrier free but finding a device compatible with all the LTE and HSPA bands is a mess again. Only phone that has an upper edge here is the iPhone 5+. It supports both CDMA and GSM bands so users have kinda flexibility to move aroundOMG!! Is it that bad situation in the US? I'm not from USA, but after reading your post, all I am understanding is, people can't upgrade their 920s or 925s if they are not on Verizon?? That's the worst situation for Windows Phone marketshare then, as they might lose many loyal 920 n 925 users.
Not all but yes most do. But even if they do, GSM band compatibility for LTE/HSPA+ is still dicey in some cases^ don't almost all CDMA devices also support GSM (for roaming purposes).