i am on orange as well. thought id write this as i had the same problem with oranges technical support personal until i found someone there who actuall knew what he was talking about. i dont know whats in this chappies manual but heres a quick rundown.
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Contact orange and ask them to activate GPRS support on your phone. they will send u and update ( can take up to 24hrs ) on reciving update read, delte, then turn off phone, remove batterym replace battery turn on phone.
thats the easy bit.
Now go into your phone, SERVICES, SETTINGS and selct Orange GPRS from the list.
Your phone is now ready to go, now for your PDA.
assuming you have already paired your phone with your PDA, if not do this through the bluetooth manger.
now go to start menu, Settings, at the bottom click the Connections tab. then click on the connections icon that appears. this will bring up a new window. select Add a new connection.
Name your connection, and select Bluetooth dial up modem from the list. click next
under the number type in *99# click next
do not type anything into the fields that appear now, just click on the Advanced tab
Set your Baud rate to 115200, and under the dial strinf you NEED to type the following
+cgdcont=1,"ip","orangeinternet"
click ok. then click finish. your phone and your pda are now ready.
go into the bluetooth manage and click on the connection you have created and you should see a reaction from your phone.  | 
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