Switching from Blackberry to iPhone 4s?

So i have a Blackberry Bold and I wanted to buy an iPhone 4s off Kijiji. I'm on Rogers and the iPhone I'm buying is locked to Rogers.
I was wondering what i need to do in order to use the iPhone. For example i know iPhones use micro sim cards. Where and how can i get a new sim and keep the same plan etc etc

Please any answer will help a lot

I have had Blackberry too in the past. IPhone is definitely a good choice. I believe that almost all the carriers offer micro sim cards for sell so you don't have to worry about it. All you have to do is go to your carrier and they will sure provide you with a micro sim card.

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