I have two smartphone, a Apple Iphone 7 my teenage son thinks is his and a cheap android for me.
I remember there being a lot of fuss because apple removed the headphone jack on the 7
I think that was on the 8. My son is jacked in all day long
oh yes could have been 8 or X that they did that with
How many smartphone do you have? 
I'm probably the only person in the US who doesn't own a smartphone
I used to be that person. Then i bought an 80.00 yes only 80.00 and got a pay as you go plan. Don't use it, don't pay. 
I did have a smartphone for a while and then switched to a pay as you go and found I really didn't use either of them