Learn to answer the phone you have. Learn to make a call on the phone you have. It is actually quite easy.
Don’t bother to try learning what the phone can do.
Forget that the phone is a computer with infinite uses beyond the limited application of communicating by voice.
I know how to answer it and make calls, send texts, use the Web, etc. I’ve had a smart phone before.
It just has features that make using it more complicated than I want in certain situations.