Giffgaff

Amazing

I just got an iphone 4s outright from apple, so cost £500 squids, so needed a cheap monthly contract to make up for it! Giffgaff have been amazing, really cheap, I pay £10 a month for 250 mins, and unlimited texts and internet, and unlimited means truly unlimited, i am using 3g the ENTIRE time so this is perfect for me. Their service is really god, I haven't had any issues yet, I also recommended my cousin onto this and he got £5 credit free and so did I which was really nice :)
My signal's good, they use o2, however i live in London so can't speak for countryside dwellers.
Ummm I can't think of anyhting else to say, except that they are MARVELLOUS, I always thought Tesco Mobile was unbeatable but obviously not!