I failed to send a SMS to China, it starts with 177 number. However, I can manage to send SMS to the US number. I wonder whether international SMS includes china or not.
You can use a Canadian credit card to enjoy $2 off. But you can use your chinese credit card to buy PM voucher and put $$ into your account. As long as you have $$ in your account, it won't charge $$ from your Canadian credit card.