Yes, the GEVEY 3g turbosim works flawlessly. I used to use a very crappy i-smartphone turbosim and was assured that I would have no problems. The i-smartphone turbosims constantly lose signal, you need to put the simcard into a regular phone and put it back into your iphone to regain the signal.
I have had no such problems with the Gevey. I work in buidlings that I need to constantly patrol, and a lot of the times I need to go into concrete basements. I do lose reception there as would expected, but the signal always comes back on its own like its supposed to with any regular phone. Wifi works fine, and I am told that edge works fine too. With edge, all you need to do is go into settings and set the vpn to vpn.voicestream.com I believe is the address.
hope that helps