IPhone video recording

When I record a video on my iPhone, the picture is quite blurry and the sound is bad, too quiet. It never used to be like this it has just started to deteriorate. I have dropped it when I've tryed to record with it so that might of damaged the camera but i'm not sure.

Well it could be anything hardware wise since you dropped it but. Try cleaning your lens, rebooting the phone, and make sure your not covering the microphone while recording cause it's pretty easy to do. Also if you have taken it in a very humid place it might of affected the mic/speaker. Try just blowing into it directly to dry it out if you did take it in a humid place. If none of these work hopefully you have a warranty.