Turn Call Vibration On or Off
On many Oppo phones, the handset gives a short vibration pulse the moment you pick up or hang up a call, even with the ringer silent. If that buzz feels unnecessary or startles you in quiet settings, it comes from a dedicated toggle in the calling settings, not from your general vibration or Do Not Disturb setup.
Show or Hide Declined Events in Calendar
When a meeting invite gets declined, it often stays visible in the Oppo Calendar and clutters your day view. This makes it hard to tell which appointments are actually confirmed. A single setting in the Calendar app controls whether declined events stay on screen or disappear.
App Time Limit Setup
If one app keeps eating up your whole day, Oppo's Digital Wellbeing tools let you cap it with a daily timer. Once the time runs out, Coloros force-closes the app and keeps it locked until midnight. Each app gets its own separate limit, so you can restrict social media while leaving work apps untouched.
Autospace After Punctuation Toggle
Typing fast on your Oppo phone and ending up with double spaces or missing spaces after periods and commas? Gboard's autospace feature inserts a space automatically after punctuation, which can clash with your own typing habits or with pasted text that already has spacing.
Schedule Always-on Display
If your Oppo phone runs the Always-on Display around the clock, it keeps drawing power even while you sleep or leave the phone in a drawer. ColorOS lets you limit the Always-on Display to a fixed time window instead of showing it non-stop. Without a schedule, the clock and notifications stay visible on the lock screen at every hour, day and night.
Change SIM PIN
If you want to swap out a SIM PIN that is too easy to guess or matches an old default code, Oppo phones handle this through a dedicated lock screen for the card itself, separate from your phone unlock code. The catch is that ColorOS will not let you set a new PIN unless you can still enter the current one correctly. If that PIN has been forgotten, this menu will not help and a carrier unlock becomes necessary instead.
Change Default Event Duration in Calendar
If every new calendar entry on your Oppo phone comes out as a full hour, even for a quick call reminder, the default event length in Google Calendar is set too long. This gets worse when several accounts are linked, since each one can carry its own default. Manually shortening every single event afterward wastes time and gets annoying fast.
Add a New Contact
Saving a new number on your Oppo phone is not always obvious because the Add button in the Contacts app is easy to miss on a crowded contact list. Without a saved entry, incoming calls and texts show up only as a number instead of a name, and details like address or birthday never get stored. This makes it hard to organize contacts across calls, messages and other apps that read from the same address book.
Change Notification Volume
When notifications on your Oppo phone are too loud or barely audible, the culprit is usually the separate Notifications volume slider, not the ringtone or media volume. This affects app alerts and incoming text messages, which run on their own volume channel in Coloros. Turning up the ringtone alone often has no effect on this.
Change Keyboard Layout
Typing the wrong characters on your Oppo phone usually means the keyboard layout does not match the language you expect. German input calls for QWERTZ, English for QWERTY, and depending on the region you might need AZERTY, Dvorak, Neo2 or Colemak instead. Gboard on Coloros lets you add or switch these layouts per language, but the option sits several menus deep and is easy to miss.
Turn Mobile Data On or Off
If apps stop loading anything once you leave Wi-Fi range on your Oppo phone, mobile data is probably switched off, or the wrong SIM is set for internet use on a dual-SIM device. ColorOS routes all cellular internet traffic through one single toggle, so a wrong access point can block traffic even when that toggle looks enabled. Checking the actual mobile data status first saves you from chasing the wrong problem.
Turn Wi-Fi On or Off
If your Oppo phone won't connect to your home router or a public hotspot, the Wi-Fi radio itself might be switched off or stuck in a weird state. This also happens after a system update, when the toggle looks active but no networks show up. Before troubleshooting a specific network, it helps to confirm Wi-Fi is properly enabled or fully disabled first.
Turn On-body Detection On or Off
Your Oppo phone stays unlocked the whole time you are carrying it, even after you slide it into a pocket or bag. That is On-body detection at work, a Smart Lock feature that reads motion sensors instead of checking who is actually holding the device. If someone else picks up your phone while it is still moving, they get straight in without a PIN or fingerprint.
Add Emergency Contacts for Emergency SOS
If Emergency SOS or emergency SMS on your Oppo phone only reaches the default 112 number, no personal emergency contact is stored yet. Without at least one saved contact, alerts and location messages during an SOS trigger won't go out to anyone you know.
Turn On/Off Screen-off Gestures
If double-tapping the display or drawing a quick O or V symbol does nothing while the screen is off, Screen-off gestures are probably disabled on your Oppo phone. These gestures let you open the camera, toggle the flashlight, or wake the display without pressing the power button. A single option in the convenience settings controls all of them.
Turn Bluetooth Tethering On or Off
If a paired device cannot reach the internet through your Oppo phone, Bluetooth tethering might be switched off or the device connection was never approved. This function shares your mobile data over Bluetooth instead of Wi-Fi hotspot or USB, which helps laptops without hotspot support and saves battery compared to Wi-Fi sharing. Each paired device needs the option allowed on its own before data actually flows.
Turn Assisted Dialing (Roaming Assistant) On or Off
Calling contacts while traveling can fail on an Oppo phone because Assisted Dialing quietly inserts a country code you never asked for. This roaming assistant reacts whenever the network detects you outside your home country, even for numbers that would normally dial fine without a prefix. If that auto-added code breaks the call or reaches the wrong number, the fix is to switch the feature off and dial manually.
Turn Notification Badges On or Off Per App
If notification badges do not show up on some app icons on your Oppo home screen, the per-app Badge toggle is likely switched off. ColorOS only displays a small dot instead of a number, and each app has its own switch tucked inside the notification settings. Missing dots often get mistaken for a wider notification bug when it is really just this one setting.
Show or Hide Birthdays in Calendar
Birthdays from your contacts do not always show up in the calendar app on an Oppo phone, even though the dates are stored correctly in your Google account. Usually the birthday calendar layer is just switched off or the sync has not caught up yet. This affects anyone who wants a quick overview of upcoming birthdays without opening the contacts app separately.
Change Google Backup Account
If your phone backs up to the wrong Google account, storage on that account can fill up fast or you may not find your backup when setting up a new device. This mix-up usually happens after switching Google accounts on the phone without updating the backup destination in Storage and Backup. The good news is the backup account is not locked in and can be swapped at any time.
Resize a Widget on the Home Screen
If a widget on your Oppo home screen only shows a fixed size and won't stretch right after you add it, that's expected. Coloros only unlocks resize handles once the widget is already sitting on the screen, not while you're still picking it from the widget drawer. That's a different flow than on stock Android, where some launchers let you size a widget before you even drop it.
Schedule Dark Mode Automatically
Switching Dark mode on and off by hand every day gets old fast, especially if you forget it at night and the screen stays bright. ColorOS lets you set fixed times so light and dark mode change on their own, but the option is easy to miss inside the display settings.
App Download Preference (Wi-Fi or Mobile Data)
New apps from the Google Play Store only download over Wi-Fi on your Oppo phone by default, and a large install can sit there waiting instead of finishing over mobile data. This is controlled by a setting inside the Play Store itself, not by Coloros. You can allow downloads over mobile data at any time, or set the Play Store to ask you every single time before it uses cellular data.
Display Short Calendar Entries as 30-Minute Blocks
When a day view is packed with quick appointments, entries lasting just a few minutes can shrink into thin slivers that are hard to read or tap. The Google Calendar app on Oppo phones has a display option that stretches these short entries so they take up the same visual space as a standard half-hour slot. Without it enabled, brief tasks and reminders often get buried between longer events.