For phones with operating systems lower than ColorOS 2.0, Oppo has integrated the Find My Phone feature directly on the device. However, with ColorOS 2.0 and above, this feature has been removed as seen on the Oppo Neo 5. Therefore, we will use the Find My Phone function provided by Google to locate a lost Oppo phone as per our instructions below.
Guide to locating a lost phone via Google Maps
Locate Lost Oppo Phone Using Find My Phone
Step 2: Go to the Settings menu.
Step 3: Scroll down and select Accounts and Sync section.
Step 4: If no Google account has been added, click on Add; if already added, proceed to step 7.
Step 5: Tap on Google.
Step 6: Sign in with your Gmail account (If you don't have one, sign up for Gmail).
Step 7: Access here and log in with the Google account matching the one newly added on your Oppo device to locate your Oppo phone.
Once you have determined the location of your Oppo phone, you can ring the device, lock it, or erase all data if necessary. That's how we guide you to locate a lost Oppo phone using Find My Phone.
https://Mytour.vn/tim-lai-dien-thoai-oppo-bi-mat-bang-find-my-phone-2938n.aspx
For iPhone users, you also need not worry because iPhone has integrated the Find My iPhone feature, which works similarly to retrieving an Oppo phone.