Hi, if I buy a factory unlocked iPhone from Apple will it allow tethering on all GSM SIM's? With an ATT locked phone you have to get ATT to allow tethering but if the Phone is factory unlocked is tethering always allowed? I'm asking because if I buy a local Sim abroad then I can't imagine that they can remotely control on a phone if thethering is allowed on the iPhone. So if tehtering is blocked by default that would be a big drawback. Has anybody with a factory unlocked 3GS or 4 tested this? Thanks.