new software requiring more resources and optimized specs for newer software, if you dont update your phone you wont need to buy a new one my ipod touch 4th gen still goes strong never updated it from OS 4 but i use it as a desktop clock lol
It's funny that you don't see newer versions of Android struggling on older Android devices, when in fact the new software speeds up the older Android phones.
As if samsung phone doesn't slow down with time... Use an iPhone fr 3-4 yrs. Use a Samsung phn fr 3-4 yrs. U will cry while using samsung. IPhone will still run fine.