What is the lowest credit score sasktel will allow to buy an iphone?

I want to buy an iPhone but my credit score is at 600 or below. And i really need a good phone but i know they do credit checks and sometimes don't allow you to have a contract if your credit score is too low and i was wondering what was the lowest and if that is too low.

I found this

http://www.amazon.com/...zon.com/s/
Hope it help