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
Vodafone has several possible options for Pay As You Go SIM cards. Try each one in turn until the connection works. All use the same username and password.
APN (contract): internet
APN (PAYG): pp.internet
APN (PAYG): ppbundle.internet
APN (PAYG): smart
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: btmobile.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
GiffGaff (uses the O2 network)
APN: giffgaff.com
Username: giffgaff
Password: password
