Hi all my phone keeps about a week of my recent calls so auto deletes them. How can I change this as a friend of mine has calls on his from day 1 and every so often it will come up to clear them when he tries the phone freezes. If he presses the home button it exits as it should but try to make a call and the clear all calls is stuck on the screen. So he has to restart the phone each time it happens which is at least once a week. He has a 3Gs (only couple of months old) running 4.0 firmware. Any ideas ?