Cant connect to the internet via T-mobile UK

I have a Nokia 6300 and i am able conntect through to internet on my phone without problems using the Virgin network.

I have now changed my SIM to t-mobile because they are giving away 5 days free internet access but i cant connect directly via my phone. It keeps saying 'Subscribe to packet data first' i have been through all the setting on the phone, I have switched on packet data to be 'always online' (not 'when needed') and been down google, i tried these settings:

GPRS APN address: general.t-mobile.uk

from
http://www.filesaveas.com/gprs.html

but i still get the message 'Subscribe to packet data first' followed by 'link not available'. However, i am able to connect to the internet if use my phone as a USB modem on my PC.