Available Now: Buy the new iPhone 14, iPhone 14 Pro and iPhone 14 Pro Max from AT&T!
spoom2's profile
#1 Star!
Helpful 1
Supersonic 25!
ACE - Master

ACE - Master


16.5K Messages

Sat, Oct 10, 2020 6:41 PM


Info on deregistering cordless handsets

This is an information only topic which is why it is closed to posting.  The following are ways proven by the users of this board to force a deregister of a cordless handset.


Method 1

This works on many different makes and models of cordless handsets. 

At the handset(s) do the following

*331734# followed by menu/select

The phone beeps twice, reboots and then comes back up ready to register to a new base station.

Registering to the new base station is now accomplished using the standard instructions.


Method 2

For here: M/S = menu / select button (upper right)
1) M/S, scroll to SETTINGS, M/S
2) Enter *7890#
3) Scroll to TEST HANDSET, M/S
4) Scroll to NEXT PAGE . . ., M/S
6) Display shows OK meaning successfully reset.
7) Use OFF button to get back to main display which will flash “to register HS...”.
Place on base, will say Registered after 15 sec or so.


Method 3

Press menu, then *883247#. Arrow up, select deregister. Unplug and take the battery out for 10 seconds. Plug back in and it should be ready to register again.



This is a user to user help forum. It is not an AT&T support site. I am not an AT&T employee, read the ACE's disclaimer at the bottom of this post

Award for Community Excellence 2021 Achiever*
*I am not an AT&T employee, and the views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.

ACE - Master


16.5K Messages

1 عام مضت

Variation on Method 1

Press Menu/Select,

Scroll to Settings,

Press Menu/Select,

Then *331734#. 

The display shows: "Reg Clear"

Press Menu/Select.

Thanks to @tehevanthomas  in this topic

Need help?
New to AT&T Community?
New to the AT&T Community? Start by visiting the Community How-To.
New to the AT&T Community?
Visit the Community How-To.