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"Line in use" message on Motorola 450 cordless phones

Both my handsets have a "line in use" message; I have no dial tone and cannot make or receive calls (incoming calls go straight to VM). I have no other phones or faxes using my land line, but I do have DSL internet, which is working fine. I did try unplugging the cordless system and trying to use my old "plug-in" phone, but it's as if the line is still in use and there's no dial tone.

I've tried unplugging the charger and removing the batteries for a few minutes and then plugging it back in; the problem is still there.

Any help would be greatly appreciated!

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Call your ip internet provider ATT etc.
your dsl is incorrectly wired

Posted on May 28, 2009

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1 Answer

My motorola Model K704B is saying "no line in what can I do to fix it


The "No Line" message means that the base of the cordless phone either doesn't have power, the line is damaged or that the handset/base are not communicating properly. To diagnose the problem, first check that the base AC cord is connected to a good outlet. You may want to unplug the cord from both the phone and the wall outlet and then plug it in again. (I've seen a case where someone turned off a surge protector and forgot to turn it back on; without power, the cordless phone won't work.)

To check if the problem is the phone line, I like to use an old corded telephone. Plug the backup phone in and check for a dial tone. If there is no dial tone, try a new RJ-11 cord. If there is still no dial tone, try the test phone at another jack. If you can, find the box where your telephone line service comes in. Open the box and look to see if there is an RJ-11 jack. If that jack is present, try using the test phone and listen for the dial tone. If there is no dial tone at the service box, contact your phone company. They should fix this problem for free. (It's possible that rodents have damaged the phone line outside of your home.) If the box doesn't have an RJ-11 jack, you'll need the phone company to test the service and repair it if needed.

If there is a dial tone at the service jack, then you have an inside problem. If there was no dial tone at only the first jack, you can check the jack itself. Unscrew the face plate and look at the back of the unit. There are two types of connections. If you have the screw terminals, look for a disconnected wire. Strip a new section of wire and secure it under the correct screw on the face plate. See http://cablesupply.com/content/47-telephone-connections-and-rj11 for the wiring pattern. If the jack uses a keystone, you'll need a punch-down tool that is available in many hardware stores in the electrical wiring section. Do not strip the conductor; just push it down into the correct slot of the keystone. If the problem is not at the jack, you'll need to check all of the wiring from the service box for damage. Your telephone company will do this for a fee.

If the test phone had a dial tone at all of the telephone jacks, then the problem is with the cordless handset and the base. One of the two units is not communicating correctly (transmit/receive). If your cordless phone is still under warranty, contact Motorola. If only one handset can be used with the base, replace the phone. If your cordless phone can pair multiple handsets with the base and only one handset is giving the "no line" message, replace the handset.

I hope this helps.

Cindy Wells

Feb 05, 2016 | Motorola Cell Phones

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All of my handsets say phone in use and i cant get them to hang up


Please check the line input at the base, if the cord is damaged or the line has no dial tone, you'll receive that message in all headsets, you could test by connecting any basic wired phone to the same cord, if there's dial tone maybe you have a defective handsets base.

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Handset displays "Line in Use" no dialing tone and


I can't get dial tone either. Let me know if you find a solution please.

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The phone lights up when put to charge also the red light on the base,, but when the phone line is connected it wont work ..What do u think is the problem?


The battery in the handset could be bad . First I would test that the base unit is recieving dial tone by pressing speaker button on base unit. If there is dial tone then problem is in handset or in base unit communication to handset. Try resetting power to base unit. Check manual for any re-initialization procedure. If the base unit is not receiving dial tone then I would test that the phone line is delivering dial tone to the base unit by connecting a known good phone to the line cord. If the dial tone is not present , problem could be in line cord from outlet, outlet, building wiring, or service provider.

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Please disconnect your cordless phones from telephone jacks throughout the home. The "line in use" is say that you have a short on the line, or a phone off the hook. So disconnect lines, then replug 1 corded phone in to check for dial tone. If working, continue to plug in 1 phone at a time(rechecking working one each time) to find the equipment that is causing you heartache.

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Using:
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Quickly, return this Phone is you still have a chance, my small business used this phone for EXACLY 2 years, and now all lines are DEAD, NOT A SINGLE ONE WORKING. LINE ONE AND THREE HAVE NO DIAL TONE EXCEPT EXTREMELY LOUD STATICS. AND LINE 2 AND 4 ARE TOTALLY MUTED.

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