Hi everyone, I did some extensive searching, and I just wanted to verify when I travel internationally from the US the features I want to use with the settings I plan on using on my unlocked 4S: 1. If I remove the US SIM, I can use Wifi (including iMessage) and GPS without incurring any international charges from AT&T. I will disable sending iMessage as SMS. I already have local maps downloaded onto a GPS app so won't need data plan to download maps as I go. 2. If I get a temporary SIM in South Africa, I can continue to use iMessage under my US phone number as long as I don't disable and re-enable iMessage. (That way it does not re-register iMessage with my temporary South African phone number.) That seems to mean iMessage will work with my US number at least under Wifi. 3. My question is, can I still send iMessages under my US phone number when sending with cellular data via the South African SIM? (Assuming I don't turn off/on iMessages.) Any additional info is appreciated. Please let me know if this is all correct. Thanks!