Right now I'm really enjoying H2o wireless, it's very cheap, and $10 USD lasts you 90 days. They apparently use the AT&T network, so the coverage is just as good as AT&T at least. Domestic and International calls are only $0.05 each, and Domestic text messages are $0.05 as well. If anyone has found something better I'd love to hear it. I don't use my mobile that much, Google Voice handles most of my business phone communications and I'm at my computer most of the time during the work day.