I currently have an iPhone 4S with a micro SIM on prepaid with Koodo. I want switch to an iPhone 5C and bought an un-activated nano pre-paid SIM. How do I switch over and still keep me phone #/account? There is a feature called "Change SIM card" in my on-line account. Do I simply use this and enter new SIM, and my phone #, SIM # and account will transfer over to the new iPhone 5C?