iPhone 4 8GB Black on pay monthly

Most people don't think in terms of megabytes.
Here's a quick look at what you could do with your data.

Apps also use your data allowance when you download them, and some connect to the internet each time you use them.

What happens if I go over my allowance
If you go over your allowance, you'll never be charged more than £1 a day in run-on costs (with a fair use amount of 40MB a day). You may wish to choose the Internet Booster as your included Flexible Booster.

Most people don't think in terms of megabytes.
Here's a quick look at what you could do with your data.

Don't forget, if your plan includes 500MB or 1GB of data, you can always email and browse the internet and you won't be charged any extra.

Apps also use your data allowance when you download them, and some connect to the internet each time you use them.

The legal stuff you need to know about data use
We'll monitor how much you send and receive each calendar month so that we can protect our network for all our customers.

If you use more than your fair use amount, we won't charge you any more, but we may restrict how much you can use your internet.