280 creates 930 a task todo in the called user 39 s calendar representing the call this may resemble a graphic icon the caller also sets the start time of the call and an end time when the caller wants to be called back if the caller decides to cancel the call processing continues at step 950 where the caller cancels the call and removes the call from the called user 39 s calendar and terminates the calling process at step 955 at step 935 the dialer 280 checks to see if the start time set by the caller is after the current time if the start time is after the current time the dialer 280 loops the calling process if on the other hand the start time is not after the current time the dialer 280 checks to see whether the end time is after the current time at step 940 at step 945 if the end time is after the current time the dialer 280 checks to see if the call task entered in the called user 39 s calendar has been deleted by the user if the task has been deleted the dialer 280 cancels the task and removes it from the user 39 s calendar at step 950 if the task has not been deleted from the called user 39 s calendar then at step 960 the dialer 280 checks to see whether the called user has set the u201c do not disturb u201d sign if the called user has not set the u201c do not disturb u201d sign the dialer 280 checks for.