I've tried everything to get my landline phone working.  The call display keeps showing line in use when in fact the phone isn't being used.  I've done a reset on the phone modem by unplugging the power cord from the power outlet and unscrewing the coaxial from both the modem and the wall and removing the battery from the modem.  And all cables are affixed firmly.  Does anyone have further suggestions?  Thanks for any help you can give me.