Hello!
From these forums, I understand it is possible to unlock the iPhone 4S for international usage of a foreign SIM card. Currently, I am in Singapore for the next six weeks and I did not unlock the phone before I left.
I want to unlock the phone, but I think it needs to be on a cellular network for this to be done. Singapore only uses GSM, so I would not be able to pick up any cellular service whatsoever. I do have access to WiFi, therefore I can make voice calls... but I'm guessing this is not enough to unlock the phone. Am I correct in assuming this?
Thank you for your time.