There are a few undocumented changes to the iPhone’s features hidden in the device’s recent update:

• In the Favorites list in the Phone module, the iPhone‚Äôs equivalent of a speed-dial list, you can now have 50 entries instead of 20.
• In the email module, you can now automatically BCC yourself on every message you send, allowing you to get a copy without revealing to the sender that you are doing so.
• The iPhone can now play music through many previously incompatible car adapters and other external speakers originally designed for the iPod.
• Wifi networks with security enabled no longer require you to specify whether it‚Äôs an ASCII password or HEX passcode.
• Bluetooth no longer drops connection to many in-car BT handsfree setups (Audi and others).
• IMAP no longer requires a ‚Äúpath prefix‚Äù field to display folders. Also, it no longer crashes the Mail application.
• Album view no longer gets ‚Äústuck‚Äù in a specific album if you select one, and then hit the ‚Äúhome‚Äù button.
• Passcode Lock period. You now have choices of 10, 15, 30 mins and 1 hr.
• Hosted Exchange IMAP accounts now show all of folders, instead of just Inbox, Drafts, Sent, and Trash.

via WSJ