How to increase megapixels of the selfie camera of my iPhone 4S by disassembling?

How to increase megapixels of the selfie camera of my iPhone 4S by disassembling? - 1

Huh?

Buy a new phone.

Build new camera parts and insert them into the phone.

The only way to "increase" the megapixels of a camera is to replace the camera parts with a better one, even then it most likely won't work. That is what Apple used, so that is what you're stuck with. If you want better then I suggest buying a camera.