I have been on simplicity 20 tariff for 2 months but was going over by £10 or so. I rang them up on 202 from my handset and spoke to them. Online offer on o2 12 month contract is 1600mins + 3200 texts.
I asked cheekily add on another bolton more for me and ill do it right now. She said yes no problem almost immediatley. I was very suprised. Never the less I took it. Amazing tariff. No need to look on the mins.
I have got unlimited weekend and unlimited web. What more do you need.
Call 202 from your handset now.
PS. I got my mate to try and he got it aswell. Seems as there doing it for everyone if you ask. I got him to ask for 3 boltons but refused, they gave him 2.