I'm going to South America for vacation in a few weeks and I am wondering if my phone will work strictly as a wifi device, like an ipod touch. I don't need to make calls, I just want to be able to check email and get on the internet. Has anyone done this? I know I can turn off the 3G, but is there a way to also turn off the phone call/messaging functions? I don't want to get socked with a roaming charge for recieving a text message or something while my phone is on...