That depends on your plan. If it says unlimited minutes then yes you can call unlimited to any Canadian number while in Canada. If you have daytime minutes and evenings and weekends then it'll be after 5pm until 8am you can call unlimited (some older plans have 6pm or 7pm even) and those daytime minutes use up incoming and outgoing minutes. If you have a local minutes plan the same applies but you have to be in your local calling area and calling a local number. Does that cover everything?