Each additional 500MB will cost £1. Managing your data spend is, therefore, a little complicated, but the rest should be straightforward. In short, you'll never spend more than £30 per month, provided you don't go silly streaming music or downloading apps on the move. Thirty pounds, of course, is enough to get you a decent contract, but the thinking here is that you'll regularly fall under that amount. There might be days when you don't use your phone at all (if you have one just for emergencies, for instance), or limit your usage to just a text or two in the afternoon.
It's about peace of mind. If there's a day when you have no choice but to stay on the phone for an hour, it doesn't matter — you won't be charged more than a pound at the end of the day. But is PAYG1 good value? On Three, for instance, you can send a text for 2 pence, or make a call for three pence per minute. EE's £10 "Data Pack" comes with 2GB of data, 100 minutes and unlimited texts for the month. It all depends, unsurprisingly, on your usage and the budget you want to stick to. If you're interested, we've been told Vodafone will be launching PAYG1 in early November.