I heard that people's balances get depleted when they're doing the prepaid with Fido, how can I prevent this from happening? I heard the customer relation person tell me that you have to pay for a new sin card before the expiry date of the current sin card? can someone elaborate on this for me? for instance, if I bought two phone vouchers, one on January 1 2011 and the other on June 1 2011, then that means the expiry date is now june 1, 2012? thanks