[whiw]

If you are a light user (in the UK) then 1p Mobile is excellent value. I've no links with them (apart from being a happy customer). They use the EE network, so coverage is good. Costs are 1p/minute calls, 1p/text message, and 1p/MB data, and you must top up by at least £10 every 120 days. Unused credits rollover to the next period. They have also introduced a newer scheme: £36 per year for unlimited talk and texts, and up to 250MB data/month. Again, I think that unused credit rolls over (i haven't used this option, so check the details).

[maffydub]

Yes, I use 1p Mobile too - moved from Three after they abandoned their 123 plan.

Have used it for about 10 months and been very happy with it!

(Like the parent, no links with them, and very light user.)