vegetaleb wroteActual defaut of fabrication are obvious the first minutes you use the phone, so just try it in the shop before paying.
Software problems are not a problem anymore because with Android you can just flah the rom again and again (old nokia and SE proprietary phones are history now)
Just check screen,speaker,camera and try calling...if everything is good then mabrouk
Definitely NOT! Never heard of duty cycles? The electronic components might have limited duty cycle, so they will fail after a period of time! u cannot know at the very beginning.
Sensors, touch screens, scroll wheels....All these components might have a defect, thus they will fail before expected.