Hey, Don't know if this has already been posted but I did a search and couldn't find anything. Argos are selling 1GB pay as you go iPad sims at the moment for Â£4.99 (instead of Â£9.99) which is cheaper than a top up for an existing sim! I popped into a 3 store and asked the guy when the sim becomes active and it doesn't become active until it is actually inserted into the iPad! This means you can pick up a few at a time for this super low price and keep them until they are needed! I myself will be picking up a few today ;-) Hope this tip comes in handy!