We spent quite an hour working over our contacts and their phone numbers to get them into our phones the way we want them.
I know that teens, college students and employees in meetings as well as people in restaurants and theaters sometimes have people among them who leave cellphones, letting a ring interrupt the proceedings. Naturally, the person who actually answers the call is asking for trouble.
I have read that cellphone jammers are illegal, based on a 1934 law. I don't know the law but I have seen enough and heard enough from teachers and meeting managers to know that taking phone calls in a group or a class or at the family dinner table is bad manners, bad form and a good way to get on the wrong side of those present.
A friend told me tonight that she would be interested to see how I act if we go to dinner with her and her granddaughter and the young woman's girlfriend if one or both starts to use her phone at the restaurant table.
I found these articles among others on the subject of inappropriate phone use in public:
https://www.entrepreneur.com/article/232742 use of smartphones in meetings
(This is a later hour than I usually use for sending the blog posts. I will try leaving the links in and see how it goes.)