I'm leaving for Ireland tomorrow for two weeks and I was originally going to purchase an Ireland SIM card, like O2, but I'm on a plan with my family and we never got around to going to Verizon to figure it out. So I'm turning off cellular data all together on my Verizon 4S. Will I still be able to use GPS/Maps on my iPhone even though the data is off? And what about the GPS on my iPad 3rd gen, will that work? Also I never got around to getting an official Apple UK adapter and I'm not paying $40 for the World set, will plugging the AC-USB adapter into a UK adapter work ok?