Turn SIM Card Lock On or Off
If your Oppo phone asks for a PIN every time it starts up, the SIM card lock is active. You can switch this PIN request on or off in the security settings, but you need the current PIN to change the setting. Without the correct PIN, the SIM stays locked and calls, texts, and mobile data will not work.
Reset App Preferences
If deleting a single app does not free up storage or clear leftover permission conflicts, a full factory reset feels excessive for what is really an app problem. Oppo's Coloros lets you reset only the downloaded apps and their data, leaving pre-installed apps like Gallery, Camera, and Calendar untouched. This option sits right next to the factory reset in the settings menu, so it is easy to trigger the wrong one by mistake.
Reject a Call with a Quick Response Text
When you cannot pick up but do not want to ignore the caller completely, a plain decline leaves them guessing. On Oppo phones the Reply option lets you send a short text instead of just hanging up. The tricky part is finding where the quick responses live and how to edit them before the call ends.
Create a Contact Group
Oppo's Contacts app only offers a few predefined groups like Family or Friends, and none of them match a specific team, class, or project chat. If you want to call or message the same set of people at once, you need to build that list yourself instead of relying on the default categories.
Sort Contacts by First or Last Name
When some contacts show their first name up front and others their last name, scrolling through your contact list turns into guesswork. This mismatch usually comes from the sorting order set in the Contacts app, not from how each entry was saved. Calls, Messages, and the dialer all follow that same sorting rule.
Enable Read Text on Images (Select to Speak)
If your Oppo phone reads captions or app text aloud but stays silent on plain images with printed text, the Read text on images option inside Select to Speak is probably switched off. This experimental recognition feature scans photos, screenshots and camera previews for text and speaks it out loud, but it only works once you turn it on manually. Without it, Select to Speak keeps reading interface elements while ignoring text baked into pictures.
Turn On/Off Wake Google Assistant with Power Button
Holding the power button on your Oppo phone unexpectedly launches Google Assistant, or you want that shortcut but nothing happens when you press it. This depends on a single toggle inside Coloros that decides whether a short press on the power button wakes the assistant. If the setting is out of sync with what you actually want, you either get an annoying pop-up every time you lock the screen or lose a quick way to reach Google Assistant.