"Incoming calls display as unknown, what setting must I change to see.."に関する回答I have an OPPO phone and had the same Unknown Caller come up. A University students fixed the issue in seconds by downloading the TrueLocal app off Google Play onto my phone. The app version i am using is free. 90% of incoming calls, now show who is calling me. It also goes through my phone an adds the caller name on the phone numbers stored in my phone.