Is a Uniden D1780-2W handset compatible with a Uniden EZAI2997 base? I cannot get it to register.

SOURCE: Handset not registering with base

You could try to clear all the memory from the base unit and start again!!!
Instructions to clear phone (Uniden 8855).
1. Go to your base unit.
2. Put your flip phone in the cradle.
3. Press down and hold down (AT ALL TIMES) the end (find hs) button.
4. Whilst holding down this button, take the power plug out of the wall.
5. Whilst still holding down the end (find hs) button, plug the power back in.
6. When you hear a beep from the base unit system.
7. Let go of the end (find hs) button.
8. Your phone memory should be cleared now and you are ready to repeat the process of registering your base and additional handsets.

SOURCE: How to clear all registrations from the base

One has to completely deregister all handset by pressing end and # keys together till complete de registration is shown on handset screen. if the de registration is not done as above stated method the hand set will not register will show connecting on hand set screen.

SOURCE: How to remove Uniden handset from base

The brillian people at Uniden don't feel it necessary to provide this type information in their manuals. You have to trial and error to find it, but what can you do. All you have to do to reset the base unit itself is to unplug the power, then while holding down the delete key, plug it back in. Hold the delete button down until you hear a beep, which indicates it has reset. Now you can readd handsets and they will start at 1.

SOURCE: ADDING HANDSET SAYS OUT OF RANGE

A search of Uniden support only said to call 1-800-297-1023 with handset registration issues. The rep picked up quickly and walked me through the reset procedure. Here it is step-by-step:

1. Remove battery
2. Hold down the * and # buttons and reinsert battery. You should hear a long beep. If not retry. (This is a bit awkward but hold the handset upside down and it's workable)
3. Screen will be blank. Immediately press the right soft menu button.
4. Screen will report that EEPROM is clearing and then state EEPROM Clear Ok
5. Remove battery (yes again)
6. Reinsert battery (this time there's no need to hold down any buttons)
7. Handset will reboot with Welcome screen and then state that phone must be registered (this is the status a handset should be in from the factory)
8. Place handset on base and it will register as normal

SOURCE: I have Uniden DECT1480-3.

Up to 6 handsets can be registered with the DECT 1480 phones. I have the 5 phone unit and needed to add the 6th phone. All I got was "Searching" in the display and the battery wouldn't even charge!

So here's what you have to do to get additional phones (up to 6 units) to work with the base. If you can get past step 1, it's a snap...

Step 1: Place a charged battery in the handset. This could be a problem if all your handsets are not registered, since unregistered phones don't charge (who thought of that design?). What I did was SWAP the battery from an already registered and charged phone with the new unregistered phone.

Step 2: Here's where the magic happens. Press the 'END' and '#' keys simultaneously... hold them down until a System Reset menu appears. Select "Deregister HS" and press Menu.

Step 3: Now, do the same thing again (hold down END and #), but this time select Base Unavailable and press Menu. You will see Base Unavailable Yes/No... Select Yes. Then place the handset in the base, wait a few seconds, and Voila!. it's registered. You can even change handset numbers using this menu if you play around with it.

Thank you, helpful employee at Costco for supplying the magic code. And hey there, UNIDEN... including this in the operation manual would have saved many customers much grief with de-registered phones!

Enjoy!