HTC P3600i

[robinbb]

Can anyone help me please with where the P3600i fits into the radio updates?
I have just got this phone. In general, it is running fine but it goes back in the drawer today because of a major (to me) bug...
The device will automatically connect to GSM data without 'authorisation' from the user. There is no way to stop it!
My N95 nicely asks if I want (for example) a GPRS connection. The P3600i just does it (even though it might already have an active ActiveSync or WiFi connection). Pretty expensive!
Browsing the forums, I have tried so far:
* Turning off HSDPA
* Setting Settings/Connections/Advanced to My Work or some form of null connection
Both to no avail

I have an Asus 636 with WM5. Say, with Stock Manager, I select an update and I have ActiveSync running: then the 636 just grabs the data through ActiveSync. The 3600i ignores the available link and starts a new data connection to my GSM carrier.

I have read about updating the radio rom (I have 1.46.30.11) but it does not seem clear which update and which process suits the 3600i.

Thanks