I live in UK and have a wifi/3G iPad2 and only use the 3G connection infrequently - when wifi is not available. To get a 3G service of (say) 1 gb for a month I must pay Â£10 micro sim top up. That is fine, but if I don' t use my 1 gb, after a month my Â£10 expires. To me, this is a rip off compared to PAYG on my mobile phone which does not expire. How do the phone companies get away with this and what can iPad users do? Update : I have found "3" sim cards on Amazon - 1gb for 1 month at Â£4.25 each. They are standard size and can be trimmed with a sim cutter also available from Amazon. So, having ordered three, I am now covered for 3 months and can choose when to insert and activate. Still think the mobile phone cos are ripping us off with 30 day expiry though!