I tried to email vodafone straight to find out if asda sims work, but their site is playing up for some reason.. aargh.. I will try emailing asda, and if I get a reply I will post it on here if its of any use. I also forgot about another question - how easy it is to top up an asda simmed mobile? there isnt a store near here, so I did wonder since its a vodafone network if I could just top up at any voda store..