ExactlyMy mom kept her flip phone until Verizon stopped servicing it, and forced her to get a smartphone. She got an iPhone, and kept the flip phone as a “phone book”. She kept charging and using that phone until it snapped in two. She kept her first iPhone until THAT no longer got serviced. She basically keeps all phones until they no longer work, or get bushed by the provider.
This toolike buying a new laptop every where. who does that.