5.1来了

5.1
9B176        05.16.05 P3
1.5.04 P5 04.12.01 P4
March 7, 2012 [77]       
Initial release on iPad (3rd generation)
Enhanced Siri dictation support during text input "on supported devices" (iPhone 4S in 2011) (i.e. Turn on or off Bluetooth, take a picture etc.).[78]
Carrier updates (e.g. AT&T 12.0).
AT&T indicator now says "4G" when applicable.
Baseband updates.
Battery life reportedly fixed.[79]
Fixes iPhone 4S support for Caller ID Name Display (on supported carriers – i.e. Rogers & Fido in Canada).
Users can now enter any Apple ID to sign-up for an iCloud account. Previously, they had to use (or create a new) me.com email Apple ID.
New Montesi Wallpaper
Images can now be removed manually from the Photo Stream in iCloud. Any photos deleted are now also removed from other iOS devices connected to iCloud.
Shake-to-shuffle bug fix, which caused the Music app to freeze.
The Setup Assistant caused an “infinite setup loop” for some users. When the setup was completed, the iPhone would jump back to a “thank you” screen ad infinitum. Users had to reboot the device to restore functionality.
SpringBoard bug fix, the home screen for the iPhone would sometimes fall into a state when double-clicking the home button would not display the Camera icon.
Turn on or off 3G toggle restored on iPhone 4S.
Bluetooth bug fix; enabling Bluetooth and returning to home screen, the Bluetooth icon still remains in the status bar.
Possible bug fixes on Wi-Fi signal strength on all devices.
Safari, address bar added text (Go to this address).
Improved Assistive Touch.
Improved Location Services.
License column added, under the About menu.
Support for Siri in Japanese
Possible fix to Outgoing Call No Audio (OCNA) issue.[citation needed]
New Lockscreen camera button no longer have to double tap home button just swipe up to access the Camera app.
Dictation on iPad