Over the past few months, I have taken over 300 photos on my iPhone. I just uploaded them to my computer, and now i want to delete them from my phone. Is there a trick to deleting all at once? I tried doing it through my computer, but when i said delete originals, it just turned my phone off and restarted it. And the pics are still there. Please help! I dont want to go through and delete all 300 by hand...