Hi All, This is the first time I am posting and please do accommodate me as I dont know much about all this. Here is what is happening... I am going overseas for 3 weeks. I need to use my phone there. I called up AT&T and they are asking me $500 deposit for international roaming. I have already paid $1000 for getting an AT&T line as I do not good credit history. I dont want to pay and lock up another $500 on top. So, Here is the question. Can I use Ziphone and unlock just for SIM? and then when I come back put everything back in place...like how the phone was before using Ziphone? I have a 2 year contract and plan to keep it. Just for 3 weeks... Thanks.