GSM detection/identification

[Steven Kurylo]

> And that the three "operators" I could see in my tests
> must all allow roaming on each others networks, which is why my T-Mobile
> SIM lets me see only those three. I should be able to see Verizon, US
> Cellular, and who knows what other operators from some of the places I
> tested, including my house.

I don't know why you'd ever expect to see CDMA carriers with a GSM phone.

You won't see Verizon or US Cellular or Sprint.