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