O2 UK - topup from overseas?

[PhotoJim]

Originally Posted by Phonehome

The British telecoms only accept UK credit cards for top up but you can also purchase the UK mobile vouchers at ezminutes.com

Orange takes my Canadian MasterCard. I'm not sure if it's because I called and asked to register it (and they allowed it) or if it's the default state. I was able to change my credit card number online without talking to them, though.