Have just purchased a T300 and have managed to set it up ok. However have been having the same problem as others in that I cannot download much (just a few backgrounds but no ringtones/games or screensavers as yet) and keep getting the message 'problem with connection' etc . I have searched this site and see that a lot of people are recommending to set up another wap gateway to allow larger downloads....but not actually how you go about this (without interfering with other things on the phone).
I would be so grateful if someone would take the time to go through this step by step AND let me know how to change it back if it doesn't work !!! I am on T-mobile in the uk.