I purchased a new phone while on vacation (do not have the serial #) and it is a single line that other handsets can be added to. I have charged it up and wondered if I could put some of my #'s in or will I lose them when I unplug it to take it home. Joan G
Joan G: If the base unit doesn't have a keypad, then your stored information resides within the handset and the battery will keep retain the memory in the prom storage. Thanks for the question and have safe trip home. Jerry
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The phone line is supplying a certain amount of power. If you open many parallel channels the power is distributed among active phones. The more sets there are the less power each one gets.These are the physical principles behind the limitations on the number of ringers a single line can activate (Ringer Equivalence Number)
As to the need to be using 3 or more sets on the same line and at the same time, I have a hard time understanding that.
For a landline, your phone company can activate 2 numbers, as it can enable A/DSL on your phone line.
i had the same problem with my KX-TGA650 and called repair out and they said it wasn't seating on the home base to charge, we'll see. i'm looking for a manual for this phone lost mine and cost prohibitive to order from panasonic. and download pdf is just too large.
go to website and it tells you that only a same model is able to be used with the base unit. hope this helps.
I found the model no, on the Uniden website DSS 7805WP and down loaded the manual.. there were no instructions .. but i showed where the phone book icon was .. and once inside the phone book the process was the same as the handset that came with the answering machine.
Same manual as lethean provided on a similar post but Page 24 if the previously used Base is Unavailable and your phone shows "Deregistration" in the Menu.
Base Unavailable (Handset Only)
To clear the base registration data in the handset, please follow these steps:
Press and hold  and [#] for more than 5 seconds. Select the BASE UNAVAILABLE submenu.
BASE UNAVAILABLE appears. Move the cursor to select YES, and then press the OK soft key.
ARE YOU SURE? appears. Move the cursor to select YES. Press the OK soft key.
You may need to "reset" the whole system. Do this by : 1 Unplug phone line, power to charger base, and remove the batteries. 2 Wait a couple of minutes. 3 Plug in batteries first, then phone line, and finally the power cord.
Then try to set the phones in the basecharger. (If the new battery is not charged yet, then you will have to charge it first!)
Found the following in AT&Ts FAQs for your phone, I'll leave only what might be relevant:
# Charge the handset for 12 hours. After the first charge, the battery will quick charge in only 8 hours. Re-cradle the handset nightly for recharging. The battery will not overcharge.
# Connect telephone line from base to unit to modular telephone jack. If cord is already plugged in, unplug and reconnect at both ends. Also, you may want to try another cord from a working telephone. See the owner's manual under "Connecting to Phone Line." (you can get the manual here on the product page in case you lost it)
# Try a working phone at the jack. If another phone has the same problem in that jack, the phone jack is defective.
Good luck, hope you work it out