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Big 4000 hand set

Pedro16 — Sat, 14 Feb 2026 11:48:42 GMT

Have a bt big 4000,

Able to dial number but no dialing tone, unable to receive calls.

The phone did make 1 call. That was to test it but hasn't worked since then.

Re: Big 4000 hand set

imjolly — Sat, 14 Feb 2026 14:19:25 GMT

have you checked that you don't have a message waiting on 1571 answering service?

Re: Big 4000 hand set

Debbie_G — Sun, 15 Feb 2026 08:24:00 GMT

Hi @Pedro16.

Thanks for coming to the community

If your BT Big 4000 can dial numbers but you’re not hearing a dial tone and can’t receive calls, please make sure the base unit is plugged securely into the phone socket.

If you have another phone you can test with, it’s also worth plugging that in to confirm the phone line itself is working.

Let us know how you get on.

Debbie

Re: Big 4000 hand set

Pedro16 — Sun, 15 Feb 2026 10:34:39 GMT

Hi it works ok with original cable supplied it seems to be the extension cable that's the issue

Re: Big 4000 hand set

Debbie_G — Sun, 15 Feb 2026 10:56:34 GMT

Thanks for coming back and sharing this, @Pedro16.
If the phone works with the original cable but not the extension, it does sound like the extension lead is faulty. Replacing it should sort things for you.

It could be worth checking how long you’ve had the extension cable, as you might still be within the warranty if it wasn’t too long ago.

Debbie

Re: Big 4000 hand set

Pedro16 — Sun, 15 Feb 2026 19:12:55 GMT

Yes it seems to be the extension cable as phone works with supplied cable. Just need to get different extension cable.

Bt 400 big button

Pedro16 — Tue, 17 Feb 2026 10:57:26 GMT

Hi, Ok this phone is just about to go in bucket!

It now comes up base not connected. Have checked all cables plugs etc but everything is in. Have cut power to re set it but still keep message.

It rings out but you can't answer

Re: Bt 400 big button

Pedro16 — Tue, 17 Feb 2026 20:15:34 GMT

Finally got it to work after phoning help line.

Apparently there is a registration on the phone menu this needs to be done for it to conect to base. Not one mention of this on the start up instructions 🙄