[chicagolab]

I am going to South America next week and will soon do another BMW ED. I have an Iphone 2g and am on the ATT network. I was wondering if I unlock to iphone for use abroad what happens when I reinsert the ATT SIM. Will I have all the regular features including visual voicemail and internet, etc. when I put my ATT sim back in? If I lose any functionality when I return then it doesn't make sense for me to unlock the phone for a couple of trips and I'll just get a prepaid phone abroad. But if when i reinsert the ATT chip all functions then there is little downside.

Anyone have experience with this??? Help appreciated