no sound on playback of videos

[Tickelme76]

I recorded a video of my baby girl laughing, and play it back but it had no sound. I have a 4s with IOS 7.02 installed. Also callers can't hear me when on speaker, but Siri works fine. any thoughts

 

[iphone01ninja]

Are you sure you did not turn the voice button down?

 

[Tickelme76]

I recently discover that my mic is plug