I dropped an AT&T sim into my Verizon iPhone 5 to make sure it's unlocked since I'm going to Iceland in June. It worked perfectly an said "no service" (deactivated sim) instead of "no sim". So good, I know it's definitely unlocked. However, I couldn't find the APN settings menu. Is the sim supposed to recognize the proper settings automatically? When I go overseas I wanna make sure I can just pop in the sim and go. Any trick I need to know to get to the APN settings if needed?