Thank you for your answer. I have changed my /etc/wvdial.conf: [Dialer Defaults] Init1 = ATZ Init2 = ATQ0 V1 E1 S0=0 X3 &C1 &D2 +MS=34 Modem Type = Analog Modem Baud = 460800 Modem = /dev/ttySL0 ISDN = 0 Phone = 087305656 Password = Password Username = Username #Init3 = ATX3 Carrier Check = no Stupid Mode = yes But still I get the same problem: ezhik@ubuntu-laptop:~$ sudo wvdial /etc/wvdial.conf [sudo] password for ezhik: --> WvDial: Internet dialer version 1.60 --> Warning: section [Dialer /etc/wvdial.conf] does not exist in wvdial.conf. --> Cannot get information for serial port. --> Initializing modem. --> Sending: ATZ ATZ OK --> Sending: ATQ0 V1 E1 S0=0 X3 &C1 &D2 +MS=34 ATQ0 V1 E1 S0=0 X3 &C1 &D2 +MS=34 OK --> Modem initialized. --> Sending: ATDT087305656 --> Waiting for carrier. ATDT087305656 NO CARRIER --> No Carrier! Trying again. --> Sending: ATDT087305656 --> Waiting for carrier. ATDT087305656 NO CARRIER --> No Carrier! Trying again. --> Sending: ATDT087305656 --> Waiting for carrier. ATDT087305656 As always it waits a little before reporting No Carrier. Thanks, Maksym