I arrived in Chile yesterday and I wanted to tell everyone how the service works.
First, I called Global services and I activated my sim card while in the US. Since Chile has 3G, the rep also added a 65 dollar unlimited data plan so I could do email/web on my phone.
I also got my phone unlocked by placing an colombian sim i had laying around and I was prompted for the unlock code. I did not have a chance to try a att/tmob sim but due to recent forums postings, i dont think it wouldve work.
When I arrived in Chile, my phone got a 3G signal and I was checking email and browsing in no time. I been using google voice text service to keep in touch with my friends back home since google voice uses data to trasmit text. One note, i have GV forward my text to gmail so i can keep the sms thread going with gmail to make absolutely sure i dont get charge for txt messages through vzw.
Now here is the best part.
I purchased a sim from a local carrier here and i was making/receiving calls within seconds of swapping the sims out. I did not pick up 3G with that prepaid sim but i believe it has to do with the fact is prepaid service.
Then I tried a friends sim from another local carrier and it worked great also. Once again, no 3G.
I do not know what frequency those 2 carriers operate at here. All I know is that they are GSM.
I am on my way to talk to a local tech to see if i can use a prepaid 3G card as I know that it works with my vodafone sim, so the phone is capable of using 3G.
Hopefully this information will help future travelers. Ill update this posting if I can get 3G working with a local sim