On a somewhat related matter, sometimes caller ID on my cell phone, shows somebody I prefer not to talk to, like someone I was in a prior relationship with or someone wanting to be in one but the interest is not mutual. At one time, they were entered as a contact.
By mistake, my phone pocket dialed them. I hung up right away before they could answer, but that person called up anyway and left a VM. I texted them back that it was a pocket dial. Now, they are no longer a contact in my phone so I don't have to worry about that pocket dial.
If they call, only a number will show, and I will delete that number and any other numbers I don't recognize so that inadvertently, I won't dial their number either.