HTC Touch Pro2 - dial-up connection does not work

[ivanivanov]

Hi everybody,
I am trying to setup a simple DUN connection to internet provider in Netherlands
This is open public network.

My PPC is HTC Touch Pro2
OS: WinMob 6.5 pro
ROM 1.88.404.3 (67102) NLD

I have made the following configuration:
My ISP
Name = KPN DirectInternet
Modem = Mobile Modem
Telefoonnummer = +31676012321
User name = kpn
Password = is not needed
TCP/IP:
Use server-assigned IP-address = yes
Use SLIP = no
Use soft-compression = yes
Use IP-header compression = yes
SERVERS:
Use server-assigned IP-address = yes

The PPC starts to make connection, but after several seconds I get an error message:
“Due to unknown reason cannot make connection. If this problem remains, you have to reset your mobile apparatus to factory default …”

I have made the hard reset, but the problem remains.
I have called technical support of HTC.
They tried to setup the same connection on their Pro2 and got exactly the same error.
So, it was it least clear that this is not a specific problem of my telephone.
Finally HTC told that they have little knowledge about dial-up connections and cannot help me.
They also told that Mobile Windows does not create a modem log files.
So it is not possible to trace what exactly the problem is.

Can anyone help, please?
Is any way there to create a modem log file ?
Has anyone the same problem?
Thank you very much in advance !

[ivanivanov]

I have found solution on windowsphoneexpert forum - very simple.
"DUN uses a 1G connection called CSD (Circuit Switched Data) which doesn't work over 3G.
You'd have to make the connection on your Windows phone with "Cellular Line" not "Cellular Line (GPRS, 3G)."
So I have changed type network from WCDMA to GSM, got 1G connection and my DUN has started to work.