اینجور که فهمیدم فقط در صورت درست بودن username و password قطع نمیشه. وقتی بهش اطلاعات غلط دادم بعد از اون تیک تلفن دیگه مشغول نبود.
تو ترمینال دستور sudo wvdial رو زدم که اینم کل چیزایی هست که توش بود:
mohsen@mohsen-laptop:~$ sudo wvdial
--> WvDial: Internet dialer version 1.60
--> Initializing modem.
--> Sending: ATZ
ATZ
OK
--> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
OK
--> Modem initialized.
--> Sending: ATDT3728444
--> Waiting for carrier.
ATDT3728444
Caught signal 2: Attempting to exit gracefully...
--> Disconnecting at Mon Oct 27 14:25:46 2008
mohsen@mohsen-laptop:~$ sudo wvdial
--> WvDial: Internet dialer version 1.60
--> Initializing modem.
--> Sending: ATZ
ATZ
OK
--> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
OK
--> Modem initialized.
--> Sending: ATDT3728444
--> Waiting for carrier.
ATDT3728444
CONNECT 460800
--> Carrier detected. Waiting for prompt.
User Access Verification
Username:
--> Looks like a login prompt.
--> Sending: payam869
payam869
Password:
--> Looks like a password prompt.
--> Sending: (password)
% Authentication failed.
Username:
--> Looks like a login prompt.
--> Sending: payam869
payam869
Password:
--> Looks like a password prompt.
--> Sending: (password)
% Authentication failed.
Username:
--> Looks like a login prompt.
--> Sending: payam869
--> Don't know what to do! Starting pppd and hoping for the best.
--> Starting pppd at Mon Oct 27 14:26:25 2008
--> Pid of pppd: 14454
--> Using interface ppp0
--> pppd: Ч[06][08]��[06][08]
--> pppd: Ч[06][08]��[06][08]
--> pppd: Ч[06][08]��[06][08]
--> pppd: Ч[06][08]��[06][08]
--> pppd: Ч[06][08]��[06][08]
--> Disconnecting at Mon Oct 27 14:26:32 2008
--> The PPP daemon has died: Authentication error.
--> We failed to authenticate ourselves to the peer.
--> Maybe bad account or password? (exit code = 19)
--> man pppd explains pppd error codes in more detail.
--> I guess that's it for now, exiting
--> The PPP daemon has died. (exit code = 19)
mohsen@mohsen-laptop:~$