Just wondered if anyone has any knowledge of free sim cards? A few networks are giving away free sim cards, and I wondered if it's possible to plug them straight into a handset and start receiving texts/calls? Do you have to activate them first or put any money on the to be able to receive incoming? Previously, I've just bought cheapo handsets from carphonewarehouse that come with £10 top-up. Just wondered what the deal is with the free sims Thanks!