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I came on here to look for the same solution but it didn't take my comment and so I am sharing what I did from my research, If it says Not registered, press and hold the page button on the base and in about 4 seconds the In Use button will be lit. Release the page button and press the # button. You may have to try this a few times. The first time I tried it, it said Failed. I took the battery out, unplugged the phone from the wall and started all over again. Good luck.
The "END" and "#" key combination can be used for several purposes:
1) If wanting to use an ALREADY REGISTERED HANDSET on an alternate base, and if if the INITIAL BASE isn't available to deregister the handset:
1a) Press "END" + "#" until it for 5+ seconds (wait for it to beep)
1b) Choose the "Base Unavailable" option
1c) That'll deregister the CURRENT HANDSET so that it can be re-registered on ANY base.
2) If a BASE has a handset registered to it which you no longer want registered but the registered handset is missing or broken:
2a) Grab another WORKING handset which is properly REGISTERED to the BASE in question
2b) Press and hold the "END" + "#" key for 5+ seconds (wait for it to beep)
2c) Choose the "Deregister HS" menu option
2d) Pick the REGISTERED HANDSET # to de-register. (Every other registered handset EXCEPT THE ONE YOU'RE ON will appear in the list!)
If the battery is fully charged, You probably just need to register the handset
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to the base by following the instructions in the
Cancel the old handsets registration at the previous base unit if desired.
For additional handsets, you must register each of them at the new base unit. Only one handset can be registered at a time. A handset will be assigned anextension number at registration. Make sure the base unit and the other handsets are not being used. Program the same way as the extra handset you bought.
were you ever able to register the additional handset? I have the same problem with 4 handsets, one broke and I bought 2 new vt2420 handsets. The unit wont register handset #3 (the one that broke). Would love to know if you were able to resolve the issue?