Hi, I have a Samsung Galaxy S3. Suddenly a few days ago all my contacts appear as unknown. I have them backed up to my google account (they are ok there) but I tried to merge and still the same. Also I can no longer make standard calls. When I dial a number and click call it goes back to the dial screen after a second. Interestingly when I go to Viber and select make standard call through carrirer, it works. From googling around it seems it might be due to an app. Is there a way to see what apps have access to my contacts or my normal phone dialer? Otherwise a factory reset might be my only option.