And will I get unlimited data with any plans?
Lexie, I don't see why you wouldn't be able to use your iPhone 4 with Koodo Mobile. To get unlimited data, you'll have to subscribe a plan that offers it as part of the total package. It would be best for you to check out the Koodo Mobile web site for more info on this. You can start here on this page on the Koodo Mobile web site for the iPhone 4S: https://shop.koodomobile.com/prepaid/iphone/apple-iphone-4s-8gb/prodKLAI4S8GBBKPREPAID.html