Does not ring in sleep mode
It could be a couple of issues, but I wanted to make sure of one first. Does this happen at specific times where you state "sleep mode", or anytime the screen is off? If you had a time set for Apples "Do Not Disturb" then you would need to change the time or disable it altogether. If this happens when a little moon icon is in the top near the clock then this is your issue. If this is not the case it could be the ringer switch, try moving it back and forth to ring and silent to test and also if you can replicate the issue while you are using it, plug in head phones to see if audio is working at all. Your issue could be something deeper within the phone if these items or not the case. It is always recommended to backup your iPhone and then do a full restore to see if it is a software issue. My work iPhone 4S has an issue while trying to ring and doesn't even play sounds when needed. In my case it is a hardware issue, but I am going to hold off for the iPhone 6. If it is a hardware issue then it could be covered by Apple's warranty if under one year. On any purchase I highly recommend Apple Care + to cover damage and up default warranty to two years. If you can supply any more details I would be glad to chime in on them.
SOURCE: iphone does not ring on sleep mode.
I fixed this issues on a friends iPhone.
Upgrade to version 1.1.4 - and you cannot restore your backup.
SOURCE: phone won't ring in sleep mode
I had the same problem with my iPhone the only way I was able to fix it was to re-flashed the latest 2.2 firmware. Power phone off, power on by holding power and home at same time, hold power for ten seconds and then release still holding home key for another 30 seconds to put phone in DFU mode. Then plug into iTunes it will detect phone in recovery mode and allow you to re-image
SOURCE: Problem with the sleep mode of 3 g iphone
turn the iPhone off and see if that helps. If it is still under warranty, go to the apple or best buy store, depending on where you got it, and get a new one (assuming turning it off didnt work), but, if you don't want to go through that, then just turn off the phone for sleep and that will be your sleep, but, i wouldn't suggest that
SOURCE: iphone does not ring on sleep mode
1. File manager in ipcsuite
/System/Library/SystemConfiguration/PowerManagement.bundle
2. Find the file:
com.apple.SystemPowerProfileDefaults.plist
Then rename it to:
com.apple.SystemPowerProfileDefaults.plist2
3. Reboot your phone
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