[Slabber]

Wanting to cheaply test out the SIM slot in my car I picked up a Vodafone PAYG pack at Tesco (no charge for this). I added a fiver's worth of credit, popped the SIM in the slot and...nothing. Kept getting 'The data connection could not be opened. Please try again later.'

After much research and messing about the default APN (ie connection) settings were wrong. Correct ones to use (for PAYG!) in Tel> Data connection > Connection settings are:

APN: pp.vodafone.co.uk
Username: wap
Password: wap
Authentication: Normal

Finally, Audi connect works. Is it worth it? Hmmm....