I will be going to the UK in a few weeks and I want to be able to use my iPad via a 3G network. My home carrier is Rogers in Canada. What are my options for a prepaid microsim in the UK? Should I just buy/acquire a microsim when I get there or should I buy it online ahead of time? How do prepaid cards work, I go back to the UK every couple of months, can I continue to use the same card? Does my data expire after a certain period - ie. if I buy 1GB does that expire in one month and if I am back in two months will I have to buy another 1GB?