mobiles

[dirk ter haar]

hi there this is question for all you locals:
(it is about cell phones which over here in england we call mobiles so where i write mobile just fill in cell phone)
I am told that one can put any SIM card into and phone what ever the nationality, so i was planning on getting my self a canadian SIM card when i come over. my question is, what kind of network system do you have and which is the best/cheapest network?
Over here we have have about 6 main networks that are similar in cost and service.