I travel to Peru and I need my phone with another Sim card
Absolutely ! Where did you get your iPhone from? If from Koodo you'll have to call Koodo and get the unlock code. It's cheaper for iPhone via the carrier. I you got it from Apple directly, then it's unlocked already and you c just pop in a Sim and young goo to go! You can always check willmyphonework.net for Peru carrier compatibility but it's p well guarantee to work with at least one carrier for 3g while you're there.