iPhone 4s IOS 5.1.1 Update Bug (Volume Control | Ringer | Text Alerts Not Working)

Since upgrading my iPhone 4s to IOS 5.1.1 I no longer get text alerts. After messing about with the handset its also affecting –

  1. When the volume buttons are pressed on the home screen i get “ringer” and the speaker symbol appear but nothing more (ie. +/- volume)
  2. When playing back from iTunes with no headphones in, I get nothing through the internal speakers, nor do the volume buttons work, nor is the volume slider visable.
  3. When i playback Youtube content with no headphones in, I get nothing through the internal speakers, nor do the volume buttons work, nor is the volume slider visable.
  4. With headphones plugged in sound is audible and volume buttons work.
  5. Whilst using voicemail, (no headphones connected) i can play the message through the speakers and control volume using side buttons.

This is a bug! Please post on the thread here – https://discussions.apple.com/thread/3938840?start=0&tstart=0

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