I have an unlocked iPhone 5 that I plan on using while I'm out of the country for several weeks. I'm just going to buy a local SIM card and change it out. What I don't understand is where to find programming options to tell the iPhone 5 to use the SIM card instead of the normal CDMA network it uses with Verizon. All I can find is SIM card pin settings and the ability to turn off "international CDMA." With other phones I've owned over the years, there were settings to use only GSM, select the network I wanted to use, etc. Maybe this isn't necessary with the 5, but I don't want to get out of the country and have to spend hours trying to get it to work.