I honestly quite liked it, not that I ever want to go back now.
(Also, I do not have a mobile phone and I think I do not want one.)
You literally unlock the phone, type the number and press the call button.
I bought one for my 8 yod, unknown brand "Plum" and works great, battery lasts like a week.
In my case, I got it for emergencies.
A burner phone is Any phone that you can pay cash for and buy air time on it with prepaid air time cards (also for cash). Therefore No One knows who owns it.
Right button (contacts) > Add Contact (First option).
Send?
Same as before, scroll down 'till you find the contact > Right click > Send V Card.
One thing I love, on the home screen, want to search for 'Rich'? Type 7424 (Rich) and Richard is listed.. Name and contact number. From there I can press the green button to call him or right click for more options.
Incredibly simple!
My observation is a genuine one. When was the last time you tried a modern burner phone?
They are not your grandma's Nokia. They will have a brand you have never heard of and the functions will be upgraded to give lame access to WhatsApp or some other internet functionality that was not around before 2007.
The other thing is that you can quickly forget the strange button presses and hacks that went with the original burner phone interface. To take an automotive analogy, sure we hand-started cars once and you can hand-start them now but you don't get the same handle that used to come with them.
Recently I tried exchanging numbers with a friend who has a burner phone - a replacement for a lost phone.
Yes, good luck with dialling a number or storing a number in the contacts. Even sending a text is a trial of user experience, an intelligence test akin to solving a Rubik's Cube.
So it is good to see that a 12 year old can work out some of these functions. I completely failed to exchange phone contact numbers with my friend, with ten minutes of trying.