Hi, I'll be in Montauk L.I. and Santa Fe NM for two and a half weeks and want to use my unlocked iPhone 4G while I am there. Cheap is what I want, and usage will be light. Who has the best deal on limited no-contract service? It would be great to have visual voice mail and data and the like, but GSM service in those locations is the absolute requirement. FWIW, AT&T has service in both locations, and I know that T-Mobile has service in Santa Fe and probably in Montauk.