Turn Data Roaming On or Off
If your Oppo phone loses mobile data the moment you leave your home network, data roaming is probably switched off. Abroad, mobile data and sometimes calls only keep working once roaming is enabled for the active SIM. Outside the EU in particular, this setting can trigger noticeable extra charges from your carrier.
Change Media Volume
If videos, games or music play louder or quieter than expected on your Oppo phone, the media volume slider is usually the cause, not the ringtone or notification volume. This level controls audio for apps and their content separately from calls and alerts. On some ColorOS versions the volume buttons only adjust it while media is actively playing.
Restore Deleted Contacts from Trash Bin
A contact you deleted on your Oppo phone doesn't vanish right away. It sits in a hidden trash bin for 30 days, but only if account sync was switched on at the moment you deleted it. Without sync active beforehand, the entry never reaches that backup and recovery becomes much harder.
Change Ringtone
Stuck with the same default ringtone on your Oppo phone and want something else for calls? Coloros lets you pick from built-in tones, but on dual SIM devices each SIM number can carry its own separate sound. Missing this per-SIM setting is why some calls still ring with the wrong tone even after changing it once.
Turn VoLTE Calls On or Off
If your Oppo phone keeps falling back to a 2G or 3G connection for calls, call setup takes longer and voice quality suffers. This happens because VoLTE is switched off or was reset after a system update, so the phone dials over the older mobile network instead of your 4G data connection. Carrier support and a valid data plan both play a role here.
Reset Camera Settings to Default
If your Oppo camera app looks off after tweaking resolution, grid lines, watermark or video quality, tracking down every changed option one by one gets tedious fast. Filters, saved modes and exposure tweaks can pile up until the app behaves unpredictably. ColorOS includes a single function that reverts every camera option at once instead of making you undo each change manually.
Pair a Bluetooth Device
Turning on Bluetooth on your Oppo phone does not automatically connect it to headphones, speakers, or another phone. Both devices still need to confirm the connection before any file transfer or audio streaming works. If your Oppo phone cannot find the other device or the pairing request never appears, the two devices are simply not linked yet.
Block or Unblock a Contact
If a contact keeps calling or texting you and you want it to stop, blocking them cuts off calls and messages without deleting the contact. On Oppo phones this option sits inside the Contacts app rather than a dedicated blocklist screen, so it is easy to overlook. Unblocking later restores calls and texts from that number right away.
Turn On TalkBack (Accessibility)
If a single tap on your Oppo now selects text and reads it aloud instead of opening the app, TalkBack is likely running. This screen reader changes how taps, swipes, and double-taps work across the whole system. Turning it on or off correctly keeps accidental activation from locking you out of normal navigation.
Turn Power Saving Mode On or Off
If your Oppo phone suddenly dims the screen, cuts the screen timeout to 15 seconds, and stops apps from syncing in the background, Power saving mode is active. This mode can switch on by itself at low battery or stay on after you enabled it manually, and it often delays notifications and app updates. Switching it off brings back normal brightness and sync behavior right away.
Set Default Account for New Contacts
Every time you add a new contact on your Oppo phone, ColorOS asks you to pick a storage account, and that gets annoying fast if you always choose the same one. Switching between your Google account and internal phone storage manually wastes time and can leave contacts scattered across different places. Setting a fixed default account for new contacts removes that extra tap for good.
Change Home Screen Grid Size
If your Oppo home screen feels cramped with too many icons squeezed into each row, or the tiles look oversized with too few apps per screen, the grid layout is set to a fixed size. Coloros offers several grid options, usually starting with 4x6 and 5x6, and some models add extra layouts. Picking the wrong size can cut off app names or leave large empty gaps between icons.
Turn Contact Sharing via Bluetooth On or Off
If your contacts don't show up on another device after a Bluetooth pairing, contact sharing is probably switched off for that specific connection. Coloros stores this permission per paired device, so turning it on for one phone or car system does not apply to the next device you connect.
Allow or Block App Autostart
If your Oppo phone feels slow right after a restart, too many apps are probably launching in the background automatically. Each app that keeps an autostart permission keeps running silently, draining battery and RAM before you even open it. ColorOS has a dedicated manager for this, but it is easy to miss and even easier to leave misconfigured.
Show or Hide World Clock Widget on Home Screen
Added several cities to the World Clock app but can't get them onto your home screen? On Oppo phones the World Clock only appears as a home screen widget once a specific system toggle is switched on, otherwise the app stays hidden from the widget drawer. If the widget refuses to show up, or you want to remove it without deleting your saved cities, one setting in Date & time decides that.
Remove a Widget from the Home Screen
A widget sitting on your home screen refuses to move or just clutters the layout, and tapping it only opens the linked app instead of offering a way out. On some Oppo models the widget also feels stuck in place, as if it were locked to that spot.
Reset Network Settings on Oppo
If your Oppo phone keeps dropping Wi-Fi, refuses to pair Bluetooth devices, or mobile data won't connect properly, a corrupted network profile is often the cause. Resetting the network settings clears these saved configurations and lets Android rebuild them from scratch. It won't touch your photos, apps, or personal data.
Turn On/Off Wi-Fi and Bluetooth Scanning for Location Accuracy
If your Oppo phone shows your location several streets away, or apps take forever to pin you down in a city, the culprit is often disabled Wi-Fi and Bluetooth scanning. Coloros uses nearby networks and Bluetooth signals to fine-tune GPS, even when both radios are switched off. Without this scanning, location accuracy drops noticeably indoors and between tall buildings.
Camera Shutter Sound: Turn On or Off
Every time you tap the shutter button, the Oppo camera app plays an audible click to confirm the photo was taken. In quiet places like meetings, museums or theaters that sound can feel disruptive or draw unwanted attention. This toggle sits inside the camera app itself and works independently from your phone's ringer or notification volume.
Change What the Volume Buttons Control
On most Oppo phones the volume rocker only adjusts media volume, so lowering a call ringtone or notification sound needs a separate step. This becomes confusing when Focus mode or Do Not Disturb still lets a loud ringtone through, because the buttons were never linked to ringer volume. Switching the button function to ringtone volume closes that gap.
Set Default Keyboard
Installed a new keyboard app but Oppo keeps opening Gboard whenever you tap a text field? Activating a keyboard alone does not make it the one your phone actually uses. Until you set it as default, typing still falls back to whichever keyboard was active before.
Limit Connected Devices on Personal Hotspot
By default, an Oppo hotspot accepts up to ten devices at once, which slows down shared data or blocks a new phone or laptop from joining once that cap is reached. If your household needs fewer simultaneous connections for better speed, or more room for extra devices, the ten-device default is not fixed. You can raise or lower it directly in the hotspot settings.
Show or Hide the Fingerprint Icon on the Lock Screen
On Oppo phones with an in-display fingerprint sensor, a small icon lights up at the sensor spot even while the screen is off. Some people find this glowing marker distracting at night or suspect it drains battery, and want to turn it off without losing fingerprint unlock. The toggle for this sits inside the screen-off unlock options, separate from the unlock function itself.
View Messages Stored on SIM Card
Old text messages that arrived before you switched phones often sit only on the SIM card, not in the main inbox of the messaging app. On Coloros this SIM storage is hidden by default, so those messages look like they vanished. A separate settings menu on Oppo phones brings them back into view.