If you are troubleshooting hardware or signal issues, Oppo devices include a built-in diagnostic tool:
: When prompted, type in the SIMLOCK or region unlock code you received. oppo-network-unlock-tool-v-1-0-full-free-download-my-blog
: Dial *#899# to open the factory test menu. Technicians use this to verify internal hardware without needing external diagnostic software. If you are troubleshooting hardware or signal issues,
: Open your phone's dialer and enter the code *#3988691# . oppo-network-unlock-tool-v-1-0-full-free-download-my-blog
To permanently unlock an Oppo device for any network, you can typically use the built-in region and SIM lock menus: