I have a iPhone 3GS. I'm using a three sim card pre paid if that matters and having no problems. What I want to know is how I can tell if it is locked to the three network. (I brought it from someone on perthgumtree so it's not mine from new ) I went into three they were no help. I want to use a vodafone aim I have one that's ready to go. If it's looked to three will it have a little pop up saying it won't work or what. And if it's not locked how do I go about using the other sim do I need to connect it to iTunes oR something.
Thanks in advance
Thanks in advance