Some iPhone owners have noticed their clock alarms did not go off on January 1 or 2, 2011. Apple is aware of the problem, which appears to be a firmware bug.
Alarm functions will work properly again starting on January 3, 2011.
UPDATE: If your alarm is still not working as of January 3, 2011, please visit this updated article detailing how to fix your iPhone alarm.
As long as nothing is actually wrong with your iPhone, you can exit Device Firmware Update (DFU) mode without restoring the device in iTunes. To get out of DFU mode follow the same steps as a forced restart.
1. Hold down the Sleep button and Home button at the same time.
2. After a few seconds the Apple logo appears and the iPhone will boot.
3. Your iPhone is now out of DFU mode.
To put your iPhone 4 or 3GS into Device Firmware Update (DFU) mode:
1. Connect your iPhone to the computer and start iTunes.
2. Turn off your iPhone by holding down the Sleep button and slide to power off.
3. Press and hold down the Sleep button and Home button simultaneously.
4. After 10 seconds release the Sleep button but continue to hold the Home button down.
5. iTunes will pop up a window that says it has "detected an iPhone in recovery mode."
Submitted by Bob Bhatnagar on
Some iPhone owners who jumped to install the iOS 4.2 firmware update yesterday were greeted with an unwelcome surprise. Media including music, audio books, podcasts and videos disappear after the update is complete. iTunes still displays the storage space occupied by the media files, but they are nowhere to be found on the iPhone.
Opening the iPod app simply says "No Content" and re-syncing with iTunes does not bring back the media library! Apparently something was overlooked by Apple, but lucky for iPhone owners the bug fix is quick and easy. Your music files are hidden but still stored on the device. Don't restore your iPhone or take drastic measures, just follow these simple steps:
Field test mode is a special mode that changes the cellular signal strength bars on your iPhone into numbers for more accurate antenna signal measurement. To see signal strength in dB instead of bars follow these instructions:
1. Your iPhone must be running iOS 4.1. Upgrade if necessary.
2. Open the Phone app.
3. Dial *3001#12345#* on the Keypad and touch Call.
4. Your iPhone is now in field test mode.
5. To exit press the home button.
Smaller negative numbers indicate a weaker signal (for example -110 is worse than -50).
