I'm with 1p mobile where its a 1p a text, 1p per minute calls and 1p per MB of data, it costs £10 and that lasts 4 months, you then have to put another £10 on for the next 4 months and so on, but you never lose any of your credit, it just rolls over so £30 per year, it suits me being a very low user, they use EE and have UK call centres, they also do a 'refer a friend' When your friend activates their SIM, we will give them a £5 bonus for joining via your referral link. This will be added as a top-up to their phone When your friend has spent £10 of credit on calls, texts or data, we will reward you with a £5 bonus for referring them. This will be added as a top-up to your phone. I've been with them for a long time and they have been excellent.