GPLv3 is incompatible with OS distribution?

In the US, if you try to get phone service without the contract and 'free phone', you really don't save very much. I'm going through this process right now, and you really have to hunt around and _not_ go with the main carriers to save anything. A few years ago I purchased a tablet that could take a SIM card and when I went to get service, most of the phone stores I went to didn't understand what I was talking about. That's getting better now, but still only AT&T and T-Mobile can get you a SIM, The other two major carriers (Sprint and Verizon) require different models of the devices that only work with their networks.

And like it or not, the US is a huge block of customers for phone companies. the EU may or may not have more total phone users, but that market is far more fragmented in terms of the advertizing needed, the different language versions needed etc.

in the US, most phone manufacturers spend exactly zero money on advertizing, it's only in recent years that you would find any phone advertizing from Samsung or HTC (Motorola and Apple have been advertizing for a lot longer). Since the vast majority of users get their phone from their carrier, based strictly on what the carrier has on display in their store, there hasn't been much need.

One good thing about the 'smartphone wars' is that people are seeing that there are a bunch of different options, and so people are getting interested in getting a specific phone rather than just picking whatever is in stock.

as for developing fully open phones, if you were a phone manufacturer and knew that investing a large chunk of money into your own system would anger the carriers that control access to a very large number of customers, would you be eager to do so?