Is there competition? Not really.

Mobile phone brands sold by WirelessWave

WirelessWave is a telecommunications retailer with over 300 locations across Canada. If you go into any large shopping mall in Canada you'll see about half a dozen telecommunications retailers. Some sell a single brand (i.e. Fido and Koodo locations), while others sell the offering from multiple brands.  

WirelessWave, which sells to sell service from six brands, is actually owned by two of the largest Canadian telecommunications companies. (Rogers and Bell)

In country with a very limited number of mobile phone companies, and no foreign-owned competition, I'm sure that does not really help to keep prices low.