“Imagine you have loaded a game but then need to answer an email quickly without shutting the game.
This is the main effect that RAM has on how smoothly phones run.”
Do You Really Need RAM?

Jonas Leupe / Unsplash
RAM in mobile devices works very similarly to how it does in PCs.
In computers, you’re free to easily upgrade RAM if you end up having too little.
Bottom line: the more RAM you have, the smoother your machine can run with multiple apps open.
How Much RAM is Enough?
“If you are actively running [multiple data-intensive] apps constantly, then 4GB is probably too low.
It will result in your phone being laggy and slow, noticeably so.
Of course, more RAM isnt always better.