I know there have been 100's of posts on this, but I was wondering if someone could give me a general overview of how to improve battery life. Today I took my phone out of the charger at about 10 AM and by 11 PM the phone was dead. In total throughout the day I sent about 30 txts and recieved about the same amount. Had about 10 min of actual phone usage, surfed the web for 10-20 min, and listened to music for under 45 min. All other times the phone was on sleep mode. It seems like the phone should last a bit longer then 13 hrs with very little use. In case anyone is confused this is a 16 GB 3G (Black) iPhone Thanks in Advance!