I bought a used 3GS on craigslist and the seller did not disclose that it had the 6.15.00 baseband installed. I found out when I got home and iTunes wouldn't load a standard update. I figured out to load a custom ispw file, but I really miss GPS working correctly. I used to rely on the mapquest app turn by turn directions. My question is, will iOS 5 upgrade the 6.15 baseband to something that allows GPS to work? I don't even need my iPhone unlocked or jailbroken! I just want live GPS and less battery drain... Thanks!