GiffGaff is a fairly new (since Nov '09) phone provider owned by O2 and piggybacks on the o2 network.
I reckon it is pretty cheap & have joined them.
And at the moment
- Internet is free until 1 October 2010
- Goodybags are half price 'til end of Aug.
Goodybags are a bundle of calls and unlimited texts & internet that lasts a month. 100mins for £10 (currently £5) 300 mins for £15 (£7.50) or unlimited calls £35 (£17.50)
Calls & texts between GiffGaff members are free.
You're welcome to Google giffgaff and go and get your own sim card, but if you reply to this thread requesting a sim card from me it will come with £5 loaded on it and I will get £5 as well.
cheers