The Oppo smartphone always has the model name as the default device name. If we prefer to call our device "TechBone's Phone" instead of "Oppo Reno 2", we can simply rename it in the settings. The device name is displayed in various places. It is also used as a recognition name for WLAN hotspots, Bluetooth device and much more.

Android 10 | ColorOS 7.0
Step 1:  Open the  Settings
Step 2:  Tap on  About phone
Step 3:  Tap on  Device name
Step 4:  Enter desired  Device name  and confirm with  OK
  1. Open the Settings
  2. Tap on About phone
  3. Tap on Device name
  4. Enter desired Device name and confirm with OK

Oppo Instructions
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