Can I activate my bell SIM card on an iPhone 3GS?

I'm currently using an Android phone on the Bell network and my 3 year contract has half a year left on it. I recently purchased an iPhone 3GS on eBay and the carrier is Bell. In the description of the item it says that I need to insert a valid SIM with no PIN lock to activate the phone. When the phone arrives, am I able to take my bell SIM card from my current phone now and place it in the iPhone and then activate the phone on iTunes without any changes to my plan?

Look this site you can do like Rogers Canada http://www.google.de/...iphone+3gs