Chosen Solution

The device fell from my hand and the front camera stopped working in all applications such as the main Cam app and SNAP CHAT and FACE TIME ,etc. how can i fix it my self?? Thanks.

You will probably need to replace the Front Camera and Sensor Flex. Here is the guide for doing this yourself. While you have the phone opened up, check to see if the FCAM/Sensor flex is properly seated (that may solve the issue) or damaged/torn (you will have to replace it). If a replacement camera doesn’t work, then it could be either a defective replacement part or a logic board issue.