hello folks. I got an iphone from craigslist and I don't really know anything about them other than what I can gather from reading here - which i don't mind doing. hopefully these will be quick answers. 1. I'm moving overseas and would like to use this phone on a new carrier (in Colombia to be exact, comcel or movistar). It's 3G 16gb version 3.1.2 (7D11) and modem firmware 05.12.01. Can I unlock this phone? 2. I hear that 3.1.3 makes a phone unlockable. If I can unlock it how do I avoid upgrading to 3.1.3 the first time I plug it in to my macbook and fire up itunes? I'd like to get my music on it asap to use it in effect as an ipod touch before I leave in a month. thanks in advance for your help.