What will I do if my iPhone 4 front camera get blurry?

Yesterday when I took a picture of myself in front of the mirror using my iphone is working properly then when I take another shot it became blurry. What will I do?

Try cleaning the area in front of the lens

Blur is caused by camera movement during long exposures.

You need to brace the camera so that it does not move when you are shooting indoors

Step back a little then retake while staying very still.