The Old Monk

I have a Motorola A1200, and I use it sometimes to connect via GPRS. The phone is set to USB mode 'modem', and appears as /dev/ttyACM0 on my box. Here's my /etc/wvdial.conf :

[Dialer Defaults]
Init1 = ATZ
Modem Type = USB Modem
Phone = *99#
New PPPD = yes
Modem = /dev/ttyACM0
Username = guest
Password = guest
Baud = 115200
Stupid Mode = on
Carrier Check = no
Idle Seconds = 0
Abort on No Dialtone = no

There's one more catch - apparently, pppd requires an IP at the local end as well. To that end, add a line in your /etc/ppp/options file :

:192.168.0.254

My setup works wonderfully after this. If you still have problems, try adding '-vj' to the ppp options file, to disable IP header compression negotiation.