I purchased an iPhone 3G when it originally first came out, was fed up with all the drop calls and decided to return the phone because I felt ATT did not provide the 3G it advertise. Need less to say, currently working in Argentina and the iPhone came out on 22 August, as you can imagine, I bought the phone thinking changing the provided would mean better service. Boy was I wrong. GPS does not work until December I was told. Calls get drop with the same frequency as with ATT in the US. In order for me to get a nice 5 min conversation, is to disable 3G. Now, it doesn't take a rocket scientist to put 2 and 2 together. It looks like is the actual phone that's having some serious issues. The worst thing....no returns are allowed with Movistar in Argentina...you buy it, you own it.