How to remove phone numbers from a contact when they are not visible in edit mode? I have a French contact (phone number +33 ...) who went to Japan and got a mobile number there (+81 ...). We discussed via Whats App and Signal and now he is back in France.
I would like to remove his Japanese phone numbers but I simply cannot.
This is how I see his contact before the edition:

As you can see there is one French and two Japanese numbers. I then click on the edit icon and I see:

The Japanese numbers are not present.
There are nowhere to be found, I clicked on &quot;show more fields&quot;, but these are just empty extra fields.
I remove the conversations from Signal (it was registered with the Japanese number, this is visible in the screenshot) - nothing. Note that I cannot actually edit a contact in Signal, it just mentions that this (Signal) contact is in my contacts - with the possibility to open the contact and what I get is the first screenshot.
I tried to edit the contact on the phone to add something and somehow influence the Japanese numbers - nothing. I tried a similar edit the contact on a PC via contacts.google.com - nothing. I tried to use the Samsung contact app - same problem.
After using Android extensively for 10+ years, this is the first time I see that. Any ideas would be greatly appreciated.
OS is Android 10, phone is Samsung Galaxy 9+.
Short on ideas I decided to delete this contact.
Right after it was deleted, ANOTHER contact with the same name appeared out of nowhere, holding the two Japanese numbers (and only this, plus the first name, plus the family name).
I then deleted that second (invisible so far) contact and recreated one for my friend (with only the French number).
It worked and I have one single contact.
This is really a mystery to me: I had one contact for that user previously, and the other one only appeared when I erased the first one.
I exclusively store contacts in google (not in the SIM or anywhere else) so this is not a traditional &quot;merged contact&quot; view. My wild guess is that Signal must have kept is somehow and presented it in a merged view. That said - it is not possible to edit anything contact-wise in Signal, it always drives you back to the main contact entry (the first screenshot in my question).
I will put it on the shelf with other unsolved mysteries in my 25 years career in IT.