Druidh, What point don’t you get?
Did you read the second section of my post you’ve copied from? The part where I said I agree that if your out and about solo then some form of ID on you is a good thing to help identifying a person.
My initial comments in tho thread were an observation on my part of the work I do, which I qualified by putting it in its context of being a relatively urban environment. It is very rare that the identity of a person can’t be found in a reasonable time frame. The time frame being the initial dealings of the incident and the immediate enquiry that follows.
at no point have I have in this thread that anyone shouldn’t wear such an ID.
As for tracing the phone number to get a name … a quick search can be to see whether the phone number has been used to call the Police on previous occasions and whether any addresses or names are associated with it. That would generally be limited to the area in which the call handling system operates and records. Getting a name of a phone owner via the mobile operator company doesn’t happen without form filling and formal requests made.