You get the guy at the mall to swap in a new battery for $50 in most parts of the world. Its cheaper to do that every few years than buy a new phone, and I have several family members who refuse to upgrade on principle, because modern phones grew too large for their hands/pockets

Usually you get a guy at the mall to swap in a new battery for $10.

For $50 you can buy a whole new phone (refurb that is 4 yrs old from some other country)