All you can eat for a tenner.
Smartphones are capable of a lot these days. Unfortunately, a device's utility is often limited by the size of the user's data cap. You can easily blow through data streaming videos but those with smaller data caps need to be careful of their consumption so they don't hit their limit half way through the month.
Really, your best bet is an unlimited plan that allows you to download data-guzzling apps with reckless abandon. Today, Virgin Media announced an unlimited data plan for those on Pay As You Go as opposed to a contract. The tariff offers unlimited data to customers that top up by £10. Dubbed "Big Data and Texts," the tariff affords you 300 texts and unlimited data. An extra fiver will net you unlimited texting on top of unlimited data.
In addition to "Big Data and Texts," the company also announced "Big Talk," which caters to those that prefer to talk rather than tweet. Topping up £15 will get you unlimited calls to landlines, 120 any-time network minutes, and unlimited texts. You can also drop the texts and knock five pounds off the price.
Virgin says that customers will start out on their "Starter" tariff until they choose one of the two aforementioned options. The "Starter" tariff charges 50p a day for 25MB, 12p for texts, and 26p a minutes to any UK mobile or landline. If you're a current customer and want to change, you definitely can, but you won't be able to go back to your old tariff.
From 6th November, GiffGaff's lowest price unlimited package goes up to £12 per month (the £10 one is still there but will be only 1Gb). Also, you need to remember that with GiffGaff, you purchase the bundle (meaning your credit is used for that), whereas on other networks, you get the bundle for free as a bonus which means you still have your credit.
Dunno about Vodafone, but my 3 theoretical limit/fair usage is 1TB/month