Am I eligible for an iPhone 4S upgrade from bell?

I have had my iPhone 4 since October 2010, and I was wondering if there is a way to get an upgrade to the 4S, without having to pay full price? My dad would take my iPhone and I would get the 4S. Before I had my iPhone 4 I had a lg voyager and after a year I had like a 200$ thing towards a new phone from bell, idk of this helps. Thanks :D
 
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