using gnome-ppp i was able to connect to verizon’s cdma network using the v640 card. all i literally had to do at this point was plug the card in, start gnome-ppp, click on ‘detect’ so it’s not looking at /dev/modem, and done. (i did set the speed to 115200, i’ll have to rtfm to see if that’s too low)
flipp@borked:~$ ifconfig ppp0
ppp0 Link encap:Point-to-Point Protocol
inet addr:xxx.xxx.xxx.xxx P-t-P:xxx.xxx.xxx.xxx Mask:xxx.xxx.xxx.xxx
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:4 errors:0 dropped:0 overruns:0 frame:0
TX packets:5 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:64 (64.0 b) TX bytes:97 (97.0 b)
update: edit /etc/ppp/options and add ‘lcp-echo-interval 65535′ (or set it to 0). i was only able to stay connected for 2.5 minutes w/ the default (i believe it was 30)
