please don't assume everyone is as imprudent, lavish and wasteful as some stereotype you seem to have.
i replace devices when they are no longer of use to me, or if something significantly more useful comes along. actually useful not hype.
i got my current phone in 2005: i only have one phone, and this phone works well. i've repaired this phone: a year ago it fell in water and stopped working so i stripped it down, cleaned it up, checked for obviously blown circuits, replaced bits until it worked again.
i replace devices when they are no longer of use to me, or if something significantly more useful comes along. actually useful not hype.
i got my current phone in 2005: i only have one phone, and this phone works well. i've repaired this phone: a year ago it fell in water and stopped working so i stripped it down, cleaned it up, checked for obviously blown circuits, replaced bits until it worked again.