Question about Vtech 5.8GHz Cordless Phone with Digital Answering System

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My Vtech cs5121 cordless phone has no dial tone

My corded phone has a dial tone but not my Vtech cs5121 cordless phone. Why?

Posted by Anna Arthur on


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Vtech phones are junk! I have had many trouble calls for no dial tone,only to find out the Vtech phone is the only one they have,and it is defective.(It really DOES pain me to bill someone 91 dollars to tell them their 21 dollar phone is broken-always try another(preferably hard-wired) phone before calling the phone company!

Posted on Dec 30, 2012


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SOURCE: The Vtech CS5121-3 Cordless Phone


Do the following system reset:

Disconnect all power adapter cables from wallsockets.
Remove all handsets from cradles.
Remove all battery from cradles.
Check the phone socket and ensure that the line is OK. Use a corded phone to test.
Connect back the Vtech phone cable.
Fit back the batteries in their handsets.
Place back handsets in their cradles.
Connect power.

The procedure above will reset the system and will re-sync handsets to cradles. If that does not work, then some of the units in the system is defective. In that case the whole system will be replaced or repaired under limited warranty terms. Contact Vtech to get your one year warranty validated. Their US phone is 1-800-595-9511 (Mon - Fri 8:00 AM - 8:00 PM Central Time). Uk contact is listed below. The last form is enquiry for global support.

Contact Us ' VTech®

Contact Us - VTech UK

Contact Us - VTech



Posted on Nov 22, 2010



  • 115 Answers

SOURCE: phone short rings every half hour, even when no

if all your 4 units ( phones ) are rringing at the same time,the problem is on the line try to contact your network's costumer care to repair it.

Posted on Nov 01, 2009

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1 Answer

Where can I get a battery for my Vtech Cordless Phone 5.8 CS5111

Enter CS5111 battery into e-bay and take your choice!

Amazon would also provide
and Walmart online
BT 17333 Battery for VTech CS5111 CS5121 CS5121 2 CS5111 2 CS5121 3 CS5211...

Jun 29, 2017 | Vtech Lands Phones

1 Answer

Parallel set on how can i get it off

Parallel Set indicates that the CS5121 thinks that another extension is in use on the phone line. First check that no other phones are off their hook. (I have a few that can be tricky to hang up.) If you have no other extensions or if they are on hook, then you need to check if the problem is with your VTech phone or with your phone line.

For diagnostics, I like to use an old corded phone. First try a new telephone cord (RJ-11) to the base of your CS5121. Then if the problem persists, try the new phone cord with the test phone. Listen for a normal dial tone. If you hear a fast busy signal or no dial tone, try the test phone at a different jack on that phone line (if you have one). If you still do not have a normal dial tone, find where the telephone service comes into your building. Open the service box and identify the type of connection. If you are lucky, the service box has RJ-11 jacks. Try your test phone there. If you can't test the phone line or the problem persists, contact your telephone company. They will test the line and repair any outside problem for free.

If it is an inside wiring problem, inspect the wires that are in the open for damage. If only one jack is the problem, open the face plate and check for loose wires. There are two types of connections in telephone faceplates: screw terminals or punch down jacks. The wires need to be stripped (enough to go under the screw) and then secured by the screw for the first type. For a punch down jack, you will need a tool to secure the wires. The tool is available at many home improvement stores in the wiring section. See for the wiring order for an RJ-11 jack. If the problem is inside the wall, you may want to get a professional to fix the problem. Your telephone company will do this for a fee. If you have a DSL filter as part of your phone line, you may need to replace this. (At my house this is part of the outside wiring and gets fixed by the phone company. My sister has the filter as part of the inside wiring and has to fix it herself.)

If only your CS5121 has a problem, try removing the battery pack from the handset. Next unplug the telephone cable and the power adapter from the base. Unplug the power adapter from the wall outlet, as well. Wait a few minutes, then reconnect the power and phone line cord. Then reconnect the handset battery. Test your phone again. If it still gives you a problem, contact Vtech for service if it is under warranty. These phones are not user serviceable.

I hope this helps.

Cindy Wells

Nov 29, 2011 | Vtech CS5121 Cordless Phone

4 Answers

How do i enable call forwarding from my vtech phone to my cell phone

Hello! You can turn on call forwarding by pressing 72# then wait until you hear the two tones and dial your number that you wish to send the calls to and then hang up the phone. The two tones signal that it has understood your command and is putting the line into forward mode.

To turn off cal fowarding, press 73# and wait again for the two tones and hang up.

Apr 21, 2011 | Vtech CS5121 Cordless Phone

2 Answers

Necesito el manual del usuario en español del telefono vtech cs5121

Necesito el manual del usuario en español para el telefono inalombrico vtech CS5121

Aug 10, 2010 | Vtech CS5121-3 Trio Cordless Phone

1 Answer

Vtech;5.8 ghz'#cs5121-2: how do i silence the phone to turn off ringer and then turn it back on>

go to main menu select the option of ringing or tone set-up and then select ringer type select silent same procedure done turn back or u can also fallow guideline book

Nov 01, 2009 | Vtech IA5854 5.8 GHz Cordless Phone

1 Answer

Cordless phone does not charge

Hello. It sounds like your battery is either unplugged, or is just bad. If the battery somehow got unplugged, just plug it in. if it is plugged in, then your battery has gone bad. replace the battery with the same type or universal you can get at fry's or walgreens. That should take care of your problem. If it doesn't, then your charging circuit is bad on your phone. Hope this helps and don't forget to rate me. Thank you !

Sep 06, 2009 | Vtech CS5121 Cordless Phone

1 Answer

Can't dial out,

It sounds as though your system is set to pulse instead of tone, look for a switch on your phone to indicate pulse or tone, change to tone.


Jul 29, 2009 | Vtech CS5121 Cordless Phone

1 Answer

Dialing out

it's not sending a signal to the phone service check your phone lines for proper connection

Jun 22, 2009 | Vtech CS5121 Cordless Phone

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