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We have a cordless phone with 2 receivers.  Both are saying Line in Use but neither is.  I have disconnected both of them and then recconnected and the message returns that the Line is in Use.  We cannot make or receive calls on our land line.  Tried using online help features but as others have stated it keeps go to no dial tone, retrieving account inforation and then back to the beginning. Is there a problem with the phone line or the phone itself?