e-garbage: shedding crocodile tears??

By the end of 3 years a mobile fails to catch signal for good internet connectivity indicating for a change. Isn’t it the biggest scam by the mobile companies?
I am a person who loves to take care and preserve old things and all my gadgets sense my love for them. But with system upgradation, though I can make phone calls easily, for getting good internet connectivity I have to search for a new phone.
Where shall I dump my old mobile and why should I change so fast? When we brag about environmental pollution, e-garbage, is it justified for the companies to make our mobile phone systems change so fast???