United Kingdom

Orange
APN settings
 * username: (blank)
 * password: (blank)
 * APN name: orangeinternet

Vodafone
APN settings
 * username: web
 * password: web
 * APN name: internet

O2 (Pay Monthly)
APN settings
 * username: (blank)
 * password: (blank)
 * APN name: mobile.o2.co.uk

O2 (Payand GO)
APN settings
 * username: vertigo
 * password: password
 * APN name: payandgo.o2.co.uk

T-mobile
APN settings
 * username: user
 * password: pass
 * APN name: general.t-mobile.uk

Tesco
APN settings
 * username: tescowap
 * password: password
 * APN name: prepay.tesco-mobile.com

Three
APN settings
 * username: guest
 * password: guest
 * APN name: three.co.uk

Virgin
The company also provides mobile broadband services with speeds of up to 7.2Mbps and allowances of 1 and 3GB depending on the chosen package, provided through the Everything Everywhere 3G network.

APN settings
 * username: user
 * password: (blank)
 * APN name: goto.virginmobile.uk

General Information about Prepaid data plans
Most UK prepaid SIMs are completely free if you can get them posted to you. Otherwise they can be bought very cheaply in most shops, usually only at the cost of the credit on them. Some are even being given away at airports and important tourist areas.

Some UK prepaid plans will give you a free bundle of data just for topping up with £10 (or in some cases less). Offers vary all the time, and sometimes you get other freebies (like SMS) for topping up with prepaid credit.

Three
If you're on Pay As You Go, you get 150MB worth of free internet to use every time you top-up. To get the most out of your top-up, we recommend converting some of your credit to an Add-on. For example, if you convert your top-up to a £10 All-in-One Add-on you'll get 500MB internet allowance, along with 3,000 texts and 100 minutes. With this you can check web pages like Facebook® 300 times a day or Tweet 3,000 times a day, use Google Maps when you're on the move and access all your favourite sites such as BBC and YouTube. More information You can buy Mobile Broadband on Pay As You Go if you don't want a contract, which is charged as follows:

Pay As You Go Add-ons

Three will give you a free SIM, and used to give you some data for that but not anymore. See:Three free SIM

GiffGaff sim will give you a free SIM too, and until the end of this month will get you completely free data. Thereafter, it will be charged at a cap of 50p/day for up 30MB. It will be charged at 20p/MB up to the cap, and after 30 MB/day.To get a SIM see: GiffGaff Free SIM

Where to buy
Purchase from a Three Mobile store for £10 which includes £10 credit, also available online.

Sim Size
Mini SIMs as standard. Micro SIMs may be available on request (mini SIMs are able to be cut down to micro SIM size).

Simplicity on Pay & Go
No monthly contract and the freedom to change your allowance every 30 days. Get Free Simplicity Sim

Text & Web
Text & Web sim card gives you 300 texts and inclusive web browsing, when you top up just £10 a month. Get Free sim for Text&Web

If you've already got a Pay & Go sim card with O2 and want to move to O2 Text & Web, text TEXTANDWEB to 21300 for free.

How to top up
Top up your phone using your credit/debit card. Call free on 4444.

Where to buy
O2 Simplicity SIMs can be purchased from O2 website or from an O2 store

Sim Sizes
Mini SIMs available. Micro SIMs can be ordered for Simplicity customers or picked up in-store.