I assume you have restarted your phone as a way of trying to fix this? If not, try this first. Then, if that doesn't work, do a backup and restore from itunes on your Mac/PC. That will install a fresh version of 10.0.2 on your phone. That should solve the issue.
I assume you have restarted your phone as a way of trying to fix this? If not, try this first. Then, if that doesn't work, do a backup and restore from itunes on your Mac/PC. That will install a fresh version of 10.0.2 on your phone. That should solve the issue.