Pardon me since I have no idea about unlocking the iphone whatsoever. I used to have an Iphone 2g now I upgraded to 3g. I'm planning to have a vacation to the Philippines for 3-4 weeks probably 8 months from now. I'm a satisfied AT&T customer for 3 years and so I have no need of unlocking the Iphone for US use. However I don't want to pay outrageous data and voice prices for roaming so I just want to unlock the Iphone 3g for the entire time that I will be out of the country and lock it again after I come back. Can I do this w/o damaging my phone? If so, then how?