I was walking on the street with my iPhone. Listening to music, Suddenly my iPhone 'died'. Can't turn it on. Can't put it in recovery mode. I was thinking it is all over with my iPhone. The next day I was thinking to open the iPhone and change the battery as a kind of experiment.
Order the iFixit 'Pro Tech Toolkit'& 'Magnetic Project Mat' to work properly & organize. My brother has a replacement battery for my iPhone 4. So when I received my package from iFixit, I open the phone. Change the battery and... Yes! My iPhone starts again! It was the faulty battery.
Should your iPhone died and feel it will never boot up again? Before you throw it out of your window, check the battery. iFixit has anything you need to fix the iPhone.