Whichever mobile network you use, try setting the APN to 'Dynamic' initially and use the appropriate username \ password below. If it doesn't work change to 'Static' and manually enter the APN setting.
All settings are case sensitive!
Vodafone
APN (contract): internet
APN (PAYG): pp.vodafone.co.uk
Username: web
Password: web
Orange
APN: orangeinternet
Username: leave blank
Password: leave blank
O2
APN (contract): mobile.o2.co.uk
APN (PAYG): m-bb.o2.co.uk
Username: web
Password: web
T-Mobile
APN: general.t-mobile.uk
Username: leave blank
Password: leave blank
Three
APN: 3internet
Username: leave blank
Password: leave blank
Tesco Mobile (uses the O2 network)
APN: prepay.tesco-mobile.com
Username: tescowap
Password: password
Virgin Mobile (uses the T-Mobile network)
APN: goto.virginmobile.uk
Username: user
Password: leave blank
BT Mobile (uses the Vodafone network)
APN: btmobile2.bt.com
Username: bt
Password: bt
ASDA Mobile (uses the Vodafone network)
APN: asdamobiles.co.uk
Username: web
Password: web
Manx Telecom (Isle of Man)
APN: 3gpronto
Username: leave blank
Password: leave blank
Sure Mobile (Guernsey & Isle of Man)
APN: internet
Username: leave blank
Password: leave blank
Wave Telecom (Guernsey)
APN: pepper
Username: leave blank
Password: leave blank
Airtel Vodafone (Guernsey)
APN: airtel-ci-gprs.com
Username: leave blank
Password: leave blank
Sure Mobile (Jersey)
APN: internet
Username: leave blank
Password: leave blank
Jersey Telecom (Jersey)
APN: pepper
Username: leave blank
Password: leave blank
Airtel Vodafone (Jersey)
APN: airtel-ci-gprs.com
Username: leave blank
Password: leave blank
