My iphone 4's lock button is broken. Is there any other possible way to turn it on?

Its not my current phone, but I need to download music & pictures off it but its off and the button is totally unusable. I tried to talk to the Apple store but I can't get the serial number off the phone (due to the fact that its OFF ) so they were unhelpful.

Plug your phone to your charger.It'll turn it on.

You could click on the home button and then go to settings/general/about

and i would suggest you to turn assistive touch on by going to settings/general/accesibility/assistivet…