Before purchasing a cell phone, check out the McGill Classifieds, as students are often looking to sell their old cell phones or transfer their contracts. This can help you both find an inexpensive phone and avoid costly activation charges.
The Phone Booth is a store that offers phones and plans from different companies. They can advise you on the best plan to take according to your needs and usage. They have a store in the Eaton shopping mall which is a 5 minutes walk from the main campus.