I am travelling from Australia to the uk and france. I don't want to use Telstra's expensive roaming package. Can i buy a prepaid sim in the uk? Will it work in France or will i need to buy another? It's easy enough to BUY a sim (3 sell them online) but i need to be sure i can register and use it. When i bought my Aussie sim i had to supply lot of id details, so i am woried if i buy a uk one i will discover i can't use it or something. Anyone got any experience to share?