Greetings leefromkuantan,
After reading your post, it sounds like you are experiencing an error with the audio on iPhone. You may want to consider restarting the device first, and then resetting if that does not work. This article provides detailed instructions for Restarting, and Reseting:
Turn your iOS device off and on (restart) and reset
Press and hold the Sleep/Wake button on the top of your device until the red slider appears. Then drag the slider to turn your device completely off.
After the device turns off, press and hold the Sleep/Wake button again until you see the Apple logo.
You should reset your device as a last resort and only if you can't restart it.
To reset, press and hold both the Sleep/Wake and Home buttons for at least 10 seconds, until you see the Apple logo.
Thank you for contributing to Apple Support Communities,
BobbyD