I currently use T-Mobile while I visit the US. I will be going to Disney World for a week and it seems like I will only get Edge there as they have not reframed the area yet. Looking to switch to ST. I have a factory unlocked iPhone 5, so will I have to use the APN Changer or just pop the SIM in and go like with my T-Mobile SIM? Bought a SIM cutter as well as I believe ST only has MicroSIMs?