Phone does not ring for incoming calls (including all handsets)

SOURCE: No ring on handset

It may have lost the link to the base unit. Make a note of all the personal details, stored number, etc., then reset the handset. Do this by pressing the spanner button until the display changes, then press and hold the 'R' (delete) button until the handset resets. You'll have to set it up again, but at least it will link.
Spanner then 1 for ringtone, CID for volume.
Spanner then 2 for keypad bleep, 1=off, 2=on.
both cases press spanner to confirm changes.

SOURCE: rings only 3 times then message

I did not see what model uniden phone you have. check here for a manual http://www.uniden.com/index/manuals_results.cfm?cat=1

SOURCE: Phone is displaying DND (do not disturb)

Press Feature 69 Feature

SOURCE: How do I remove the do not remove the do not disturb setting?

thank you Now I feel dumb I can't belive I didn't see that

SOURCE: INCOMING CALLS

Not sure it this is a solution for ALL your problems, but...

I had a similar issue: Phone rings, caller ID info displays then seems to hesitate, then displays only "INCOMING CALL."

The issue seemed to be caused by interference with other devices on the same line (in my case, an alarm system).

Tech support had me change a setting on my TRU9466 base unit (this is one of the PowerMax 5.8ghz models). This is how we did it step-by-step on the base unit:

MENU
GLOBAL SETUP
IN-USE LINE SETUP
select LINE 1
switch to TYPE B

This seems to have solved the Caller ID "interference" issue -- my Caller ID now displays as it should. The Tech Support person suggested trying that TYPE A/TYPE B setting on "OFF" if TYPE B didn't solve the problem, but thankfully, it did.

Now Cheryl, it sounds like your issue is more involved than this -- I didn't have any connection problems -- but perhaps they're related -- you might try my solution.