20 Most Recent Uniden DCT646-2 Cordless Phone Questions & Answers

  • Press and hold the LOCATOR/INTERCOM button for the extension that is displaying "No Link To Base" on the Base until a beep sounds.
  • Press and hold the FLASH/CALL WAIT button on the Handset that is displaying "No Link To Base" until a beep is heard.
  • When registration is complete, a beep sounds from the handset.
  • Wait for 20 seconds after registration is complete to allow the handset to establish communications with the base.

If this doesn't work or it keeps happening, replace the battery in the handset.

Uniden DCT646-2... | Answered on Sep 19, 2019

try pulling the batteries out for 24 hours and then putting them back in. It should reset all the software and it should sync back up.

Uniden DCT646-2... | Answered on Apr 30, 2013

No. Your base works on the 5.8GHz band, while your DECT 6.0 handset works on the 1.9GHz band using a completely different protocol. The two are completely different technologies. It would be like trying to read a videotape using a DVD player.

Uniden DCT646-2... | Answered on Aug 21, 2012

is it on mute?

Uniden DCT646-2... | Answered on Jul 25, 2012

I had the same problem with two of these handsets. I am not certain of the cause, but based on the fix, I believe water got into the microphone holes and perhaps mixed with a water soluble glue that stuck the felt cover to the microphone. I fixed the problem by removing the battery, opening up the phone (slide the battery cover off and removed the 4 screws) and snapped open the plastic encasement. Then I remove the two screws toward the top (toward antenna) of the circuit board. This gave me access to the microphone which is on the underside of the circuit board (very bottom of the phone, below and on the opposite side of the plastic jumper for the battery) which had a thin black felt cover covered in a sticky residue that was covering the microphone diaphragm. I removed the felt and then used a cotton swab with rubbing alcohol to remove the residue from the diaphgragm. I used compressed dry air to remove any dust from the diaphgram. With the 2 screws, I secured the circuit board back in, snapped the plastic case back together. Then I finished off with putting 4 screws in the case and putting the battery in. Now other parties can hear me just like they used to when the phone was working.

Uniden DCT646-2... | Answered on Jan 01, 2011


The reason, no one can hear you on the other end is simply because there is a problem with the mouth piece of your phone.

It must have fallen or hit a hard object so the mouth piece is faulty.

You can use an external earpiece for the time being before you get the mouth piece replaced.

Replacing the mouth piece, you need to get a compatible replacement mouthpiece then unscrew the phone, try to get to the mouth piece and disconnect it from the phone and replace it with the new one you get for it.

Take care and good luck

Uniden DCT646-2... | Answered on Oct 09, 2010

Most likely, your phone is set to MUTE. Unfortunately, there are different ways of disabling the mute, depending on the model of your Uniden phone.

Check your owner's manual to see if it tells you how to cancel the MUTE function. Look in the troubleshooting section as well.

Thank you and good luck!

Uniden DCT646-2... | Answered on Jun 12, 2010

You'll need to call your phone company. (Qwest, BellSouth, SBC, it depends on where you live)

Call Waiting ID (or CID-on-Call-Waiting) is a separate feature, possibly with an extra monthly charge, but possibly it just needs a free activation

Uniden DCT646-2... | Answered on Jun 10, 2010

Check your owner's manual to see if it tells you how to cancel the MUTE function. Look in the troubleshooting section as well.

Uniden DCT646-2... | Answered on Feb 09, 2010

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