If my top button on my iphone 4 doesn't work can I turn on my phone without connecting it to a charger? I know that if your top button doesn't work and you turn off your phone then you can turn your phone back on by connecting it to a charger but is there a way to turn my phone on when the top button doesn't work without connecting my phone to a charger ?
No, there is no way to do it. To make things easier,  you could turn on Assistive Touch, but it doesn't work when iPhone is turned off.