"I am confused here. With those cards you don't need a name but if you are ordering on line or AW credits do you just leave the name bit blank??"
Re: above - I use my prime mastercard to buy credits from AW and once I registered it on (www.idtprime.com '08701440289') it work straight away with no name required at any stage. If I haven't explained it well enough I think the site and number might be helpful. It states 'to register your card for online purchases visit ....... or call ...(website & number above)' Haven't ordered anything online though myself so cant confirm that bit.
Hope this helps.
Warm Regards