I re-jailbroke my 2g iphone a couple days ago and set up as a new phone to see if it would improve my battery life. It has, slightly, but now my phone won't read out usage (Settings>General>Usage) nor can it find my location on Maps. I can use "Around Me" and it finds my location, but when I click the button in Maps it spins for a while and then eventually says "cannot determine your location"

Any help?...

P.S. Anyone have any idea how much iphone batteries cost?