Try calling Apple support or Genius Bar? I'm not optimistic, when your phone is dead one of the downsides of the highly integrated OS/Phone seems to be ability to get in. I had similar issue with my phone, no cracked screen, but slight bent but better than you could charge would actually see the Apple logo come on and could charge, but wouldn't boot up.. Took to Apple store, pretty much said w/o screen access nothing they can do to unlock it. Same issue, lose your access code forget it. I tried to pawn off two iPhones fully working, but we forget the base passcode, not the screen lock, even in the fleamarkets in China they wouldn't touch it. I was surprised they weren't even interested in the overhead for scrap value of the chips.