“I have been buying SIM’s from Mobiles.co.uk for a number of years now. You get access to the major provider ( Vodafone in my case ) at prices that are 50-75% cheaper then going directly through the provider. I have to send a screenshot of my bill every month, but then receive a cheque in the post for the money redemption element of the deal. Would thoroughly recommend if you just want to renew contract every year without having to pay full price for it!”