iphone upgrade

I have an iphone 4 on bell mobility fab 10 plan . I will be due for an upgrade in december . i am also a retired employee of aliant .and get 40% discount

I am on a fab 10 plan now . If i upgrade to the iphone 5C i will loose my fab 10 plan and need to get one of the newer plans . just wondering if its worth upgrading and loosing my fab 10 . The newer plans dont seem to have unlimited social networking , Not as much data and i loose unlimited email