I'm quite interested in taking up PAYG as opposed to pay monthly because of the better deal O2 offer. Unlimited data usage (to an extent, but same as Pay Monthly), and unlimited amount of texts for £30 a month top up. I am a big texter - so 500 a month on the Pay Monthly tariff isn't enough. What are people's opinion on PAYG with the iPhone - and for £30 a month with unlimited texts, this translates to a much better deal than Pay Monthly. I don't mind having to pay £399 for the iPhone so it is strictly the tariffs I'm concerned about.