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.

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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. Esqueci A Senha Da Minha Rede Wifi Como Recuperar.

You will see Base Unavailable Yes/No. 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! Posted on Oct 28, 2011.

Short answer: No. This model of phone can only support 4 handsets. If you need more than that, you will need to have a second base unit. Detailed answer: One of my handsets went bad, and I just bought complete DCT748-4 package from a seller on eBay for a very good price. This set was used, but in very good condition. I didn't need the whole set - just one handset - but like I said, it was a good price. Anyway, I began by telling my old base unit to de-register handset #2 (the failed unit).