Just connect the phone using cable.
Open terminal and enter command wvdialconf /etc/wvdial.conf as root
It will detect ur phone.
Now edit /etc/wvdial.conf
Phone number *99#
Username :Anything you want
Remove any semicolon if there at beginning of any line and append stupid mode = 1 at the end
You should be able to connect using the command wvdial now.