Error 679 - Cannot detect carrier

This error is caused when you are dialling the wrong number, your phone us faulty or the ISP is down. 

FIX:

Check that number is correct.

Check modem is dialling correct number. You can do this by listening to the modem speaker or lifting the phone just after it dials. You may hear someone say "The number you dialled has not been recognized" or the likes.

Check that you have not accidentally clicked on "Use 9 for outside line or a code for long distance calls" in modem settings.

Make sure regional settings are all correct, and also country settings.

You may get this error when dialling within an internal office Network. Talk to your Administrator for further Help.