I have an audiovox RTM 8000 and have had great success using it for GPRS with vodafone.
Use the network setup application to create a dial-up PPP connection . Simply launch the network setup, select Dial-up PPP.
In the Account tab, enter any name, and in the user name and password fields, enter the username and password provided by your GPRS provider.
In the phone number field, enter
*99#
In the Modem tab screen enter the following modem init string:
AT+CGDCONT=1,\"IP\",\"internet\"
However, to make this work, I had to disable the PIN on my sim card... the AT code for entering a PIN is
AT+CPIN="1234"
is there any way this could be added to the dialup plugin? I've tried putting it into the modem initialisation string but it's not successful... it might be finger trouble, or it might be a timeout issue, so any ideas would be welcome!