Cellphones on a Plane?

I have a cell phone, and I use it in public.  I used to have a hands free device, but it stopped working and I never replaced it. Sometimes, I use the speaker phone when I am on the phone. Mostly, I talk into the phone.

I do not like listening to other people's conversations in public, and try hard not to subject the people around me to a serious conversation.  I might call someone and ask about a purchase, for example, or call someone to give them an update on my status, such as "running late for our meeting."  But I really try to keep my phone conversations private.

I do not fly much, but recently took a trip by plane.  Getting on or off the plane, people were bonded to their cell phones. I heard lots of person information that I really did not want to hear.  I understand calling about status updates:  the plane is getting off late, the plane just landed late, etc.  I get that, it makes sense.

But I do not want to hear your business problems and orders. I do not want to hear your personal problems. I do not want to hear your romantic trysts, your lover's arguments, or your parent-child interchange.  

I for one, hope that airlines do not allow cell phone usage while we are flying.  Or, better yet, do not allow cell phone conversations.  If you want to text or send email, and I do not have to hear it or read it, go for it.  But no conversations.