My Vtech 15450 beeps randomly. I think it is the second phone that is doing this.

That is the phone trying to connect to the base station.

General - Product Troubleshooting - VTech® Cordless Phones

www.vtechphones.com/support/.../35/178

VTech Communications Inc.Step 1: Place the handset in the base or charger. If PRESS FIND HS 4 SEC ON BASE does not appear on the screen after a few seconds, lift up handset and recradle it in the base or charger. Step 2: On the telephone base, press and hold FIND HANDSET for approximately four seconds.

Product Registration - VTech® Cordless Phones

https://www.vtechphones.com/.../product-re...

VTech Communications Inc.Vtech DECT 6.0 cordless phones are among the most advanced and innovative homephones on the ... Product Registration. How do I register my product?

vtech cordless handset, how to register - YouTube

? 3:21
https://www.youtube.com/watch?v=dV9rZ_cYcks
Feb 22, 2015 - Uploaded by Brian Williams
i registered my handset but im not able to call and answer call from my ... you lose your phone you have to de register allphones and start over.

Bad phone line, most likely.

Best practice to save battery power is to completely close programs after you are done using them and you can also use LEO Privacy to do that.
LEO Privacy Applock Hide Safe Android Apps on Google Play

batteries last up to 3 years and from e-bay are a fraction of that price
as for time in use should be at least 1 hour for a good battery
it is vital that after use you return the phone to the charge cradle
ensure that charger is operational

Hello, Below are the instructions for voicemail retrieval for your Vtech CS5121-2 5.8 GHz Twin 1-Line Cordless Phone. I have included an easily clickable and printable PDF link of the user's manual for this phone from the official vtech web site. I hope this helps you!
- CBR2009
New message indication The message display counter will flash when there are new answering system messages. If the new message alert tone is turned on, the telephone base will beep every ten seconds when there are unreviewed messages. Message playback Press /PLAY/STOP to listen to messages. Press /PLAY/STOP again to stop playback. If you have new messages waiting, you will hear only new messages (oldest first). If there are no new messages, the system will play back all messages (oldest first). When playback begins, the total number of messages is announced, followed by the day and time of the first message to be played. Options during playback Press VOL+/VOL to adjust the speaker volume. Press >>/SKIP to skip to the next message. Press<</REPEAT to repeat the message currently playing. Press <</REPEAT twice to listen to the previous message. Press X/DELETE to delete the current message. The system will advance to the next message. Click below for PDF USER'S MANUAL http://www.vtechphones.com/docMgt/public/art/314062/cs5121_manual.i6.pdf

Open your phone and
check it, but I think this
is the right battery.
Batt-6010Vtech 89-1326-00-00
Replacement Battery For The Following Vtech DECT 6.0 Phone Models 6031
6032
6041
6042 6053
DS6111
DS6121
DS6121-3 IS6110
DS6121-4
DS6121-5

first step is to unplug all power and phone connections from the wall for all Vtech phones and bases.

Second,plug each set and base in the wall for power one at a time.

Go back to the basics and pair the handset with the base of the unit.

Do this for all sets one at a time.

manual for POCKET PC 2003 PRP iPAQ X11-15450