Apple says the handsets affected were ‘sold primarily between September 2014 and January 2015’.
If yours is affected, you’ll need to find your phone’s serial number and enter it into the official checker on Apple’s website to see if it’s eligible for the fix.
To find the serial number, simply go to the Settings app, tap on General and then About. The number can be copied over from there.
Apple says that any other hardware problems, such as a cracked screen, should be fixed before you hand over your phone for repair.

You may find you’re covered under insurance for non–iSight issues.
Don’t go handing your phone over for repair without backing up your iPhone’s data.
This can be easily done by either plugging into iTunes and storing files locally, or via iCloud, with the option to store all your app settings and files on Apple’s servers.
It’s as good excuse as any to ensure you don’t lose vital information