How to configure your Nokia mobile phone for better streaming from youtube? 

Go to Real Player- Options -Settings - Connection- Network
Set Options as below.
Default access point - (your default access point)
Online time - unlimited
Lowest UDP port - 6970
Highest UDP port - 32000
Then select Advanced Setting from options and set as below.
GPRS Bandwidth - 37.52kbps/40.2/53.6kbps
Egprs Bandwidth - 84.42kbps/125.16kbps/178kbps