i am using D-link modem with BSNL sim card and it took some changes to get it recognized as a modem and ultimately the sakis script got it to work pretty well. i still am using network manager to connect and disconnect. it will run sometimes twenty minutes, more often about an hour, and once or twice it kept running til i had to sign off. i can usually get it connected again, but it will not run very long after it has disconnected itself. what command line can i run to tell me what the problem is? or does anyone recognize what i need to do to fix it? i am not entirely literate in linux so please keep it simple.
If the modem disappears from the Network Manager applet, once automatically disconnected:
If the problem still exists:
By the way, mention the model of your dongle using lsusb command.