el 42408 handset

Try the methods listed in This topic

It didn't work 

Sorry wrong topic, try this

Hello @glads1234.

We appreciate you reaching out to us on the Community Forums. I would be more than happy to help you today.

If you still have access to the old base you can de-register the handset by following a simple process. You will have to de-register all handsets registered to that base.

1. Make sure that all handsets are out of the telephone, base and chargers before you begin deregistration.
2. Press and hold /HANDSET LOCATOR on the telephone base for about 10 seconds (until the IN USE light starts to flash), then release the /HANDSET LOCATOR button.
3. Immediately press /HANDSET LOCATOR while the, IN USE light is still flashing. (The light flashes for about seven seconds. If the light stops flashing, start again with Step 1.)
4. It takes up to 10 seconds to complete the deregistration process. Wait for the cordless handset screen to display To register, see manual before registering the handset again.
5. To register the handset(s) to the telephone base again, follow the registration instructions on the previous page.

I hope this information helps you, and if there is anything else please do get back to us. We'll be more than happy to assist you. 


Thank you for contacting AT&T Community Forums.
Veronica, AT&T Community Specialist.
   

this the type of handset.. the 3 other methods won't work. When I hit menu.. ie the center button, I do not get a settings option. It takes me to the directory. I can scroll from there into ringer volume and date and time but no settings

You don't worry about where it takes you, you follow the steps listed.  One of these methods work for the vast majority who've tried them so if none of them work I have no further answers. The information posted by @ATTHelp is only for handsets that are already registered to the original base. 

Manual found here page 11 tells you how to get to the settings. 

Hi @glads1234,

The Community Forums are a public support option where other users, and AT&T, will try and assist with high level support needs. This means we won’t be able to look into account specific concerns.  To get the help you need for your unique issue, please review our Contact Us page, and choose the best option to reach out to us.  You can call, chat, or reach out via social media, and we can review your specific issue and provide you support.  If you feel your issue isn’t account specific, and can be answered generally, please let us know, and we’ll be happy to help.

Thank you for contacting AT&T Community Forums.
Veronica, AT&T Community Specialist.
 

To at@t.. what instructions are u referring to in step 5.. what previous page?

Hi @glads1234,

The Community Forums are a public support option where other users, and AT&T, will try and assist with high level support needs. This means we won’t be able to look into account specific concerns.  To get the help you need for your unique issue, please review our Contact Us page, and choose the best option to reach out to us.  You can call, chat, or reach out via social media, and we can review your specific issue and provide you support.  If you feel your issue isn’t account specific, and can be answered generally, please let us know, and we’ll be happy to help.

Thank you for contacting AT&T Community Forums.
Natasha, AT&T Community Specialist.