it will only get the packet data settings if your sim is O2 / Orange / TMobile / Vodaphone / 3. Any others you'll need to put in the access point, username and password in because it will grab the network that it partners off. (Asda/Tesco/Virgin Mobile etc. Sims).

For Virgin Mobile (which will show as T-Mobile UK) you need to put:

Connection Name: Virgin <anything will do here>
Access Point: goto.virginmobile.uk
username: user
password: <blank>