I currently have an iPhone 4 and I am happy with the device, but I want to switch from Rogers to Koodo. I understand that I need to get it unlocked from Rogers first, but after that what do I need to do? If I take it to a Koodo store are they able to set me up there on the plan I want? I am unable to find any information if Koodo still supports iPhone 4. Also is there a fee to keep my number? Thanks!