As soon as you use your Canadian cell phone number when in Mexico, you are charged $14.00 a day as a daily rate - even with "roaming" turned off. Even if you are just receiving a text with a code to verify an account - no way around it and it is, as far as I know, a universal policy with all the companies offering cell phone plans in Canada. This policy is a fairly new and certainly has caught many people I know unawares. There is an upside to it - like if you want to pay the $14.00, I think you get some benefits if you need your phone all day for Canadian texts but I haven't investigated so not sure how it works - just sharing my own experience.