Apple iPhones will not work with Mobilicity as they are not built to run on it's network. Mobilicity’s network uses a frequency called AWS, with bands 1700/2100. If you look under the bandwaves for your iPhone you will find that it does not operate on this frequency.

http://mobilicity.ca/support/the-basics/i-have-a-phone-already-can-i-use-it-on-the-mobilicity-network/

If you have a phone that is not sold by Mobilicity and you’d like to activate it, you have to check the frequency of your device and ensure it’s compatible with the Mobilicity network. Mobilicity’s network uses a frequency called AWS, with bands 1700/2100. Unfortunately, current iPhone's don't support this technology. So until Apple comes out with an AWS compatible iPhone, you're out of luck. source