Hello & Welcome to Just Answer,
Sorry to hear of any issue you are having with your phones.
To help you with this issue, may I ask:1) The Model Number of the phone system you are working with? That model should be printed on a sticker on the bottom or back of the main base unit, and usually starts with a letter or two, and then a four-digit number. NOTE: DECT 6.0 is a generic name for the technology of the phone.2) What is the AGE of this system and HOW were the batteries CHECKED?3) Is there anything on the DISPLAY of the handsets, when you try to use them (or not)?
I see it has been a few days and I just wanted to follow up to see if you have any more questions concerning this issue or if the issue was resolved?
I look forward to any further questions or results that you may have.
Thanks, ***** *****--. .-(im)