Busy or unreachable mobile phone availability via SMS
Original Publication Date: 2001-Oct-01
Included in the Prior Art Database: 2003-Jul-23
It is a common occurrence for an individual to try and call another individual on the telephone but be unable to get through, i.e., to have progress to the point where the destination telephone is ringing. A com- mon situation is when the destination number is busy. For standard wired telephone numbers, this is gener- ally the only reason why a call cannot be completed. For cellular telephones, however, the situation is more complex. In addition to simply being busy, a very significant percentage of cellular phones are normally unavail- able. A cellular telephone can be unavailable for many reasons including that the telephone is off, the battery is exhausted, the telephone is out of range or cannot receive a sufficiently strong signal and the telephone can still be unavailable due to a lack of available channels within the given cells.