Set Up Private DNS
If your Oppo phone still resolves every website through your carrier's servers, your provider can see which domains you visit even when the connection itself is encrypted. Coloros keeps the network operator's DNS active as the default, whether Private DNS looks enabled or not. Pointing the phone to a dedicated private DNS provider hides those lookups from the local network.
Turn a SIM Card On or Off
On dual-SIM Oppo phones, calls and data keep arriving on both lines even when you only want one of them active right now. Pulling the SIM tray works, but it is slow and risks bending the tray or losing the tiny card. A hidden switch in the connectivity settings controls each SIM slot on its own, and it is easy to overlook when both cards still show as connected.
Unpair a Bluetooth Device
A speaker or headset you stopped using still shows up as a paired device on your Oppo phone, and it keeps trying to reconnect whenever it is nearby. Turning Bluetooth off only pauses that link temporarily, it does not remove it. To stop the automatic reconnect for good, the pairing itself has to be deleted.
Change Personal Hotspot AP Band (2.4 GHz / 5 GHz)
If your Oppo hotspot feels slow or drops connections when several devices join, it is probably still running on the 2.4 GHz frequency. Many Oppo phones can broadcast on 5 GHz instead, which gives connected laptops and tablets more bandwidth over shorter range. The switch has to be made manually, since the hotspot defaults to 2.4 GHz every time.
Auto Switch Between Wi-Fi and Mobile Data
If your Oppo phone keeps stalling on a weak Wi-Fi signal instead of jumping to mobile data, the Wi-Fi Assistant feature is either switched off or mobile data itself is disabled in the background. Videos buffer, messages send late, and apps time out even though the Wi-Fi icon still shows a connection. This setting decides whether your phone hands over to mobile data automatically once Wi-Fi quality drops.
Change SIM Card Name
On Oppo phones with dual SIM, both cards show up as SIM1 and SIM2 in call logs, texts, and network settings. That makes it tricky to tell a work line apart from a personal number at a glance. You can swap in a custom label for each SIM instead, up to ten characters long.
Auto Turn-Off for Personal Hotspot
If your Oppo phone keeps its Wi-Fi hotspot running long after every device has disconnected, it drains the battery for no reason. ColorOS includes a setting that shuts the hotspot down automatically once nothing has used it for a while. Without that toggle enabled, the hotspot stays active until you switch it off by hand.
Change Preferred Network Type
If your Oppo phone keeps dropping back to a slower connection or refuses to lock onto 5G, the Preferred network type setting is usually the reason. This option tells the modem which network generation to search for first, and a wrong choice leads to dropped calls, sluggish data, or a missing 5G icon. The available options depend on your device model and what your carrier actually supports.
Turn On/Off USB-OTG
If a keyboard, mouse or USB stick doesn't get recognized when you plug it into your Oppo phone, USB-OTG is probably switched off. Coloros also disables the feature automatically after about ten minutes without a connected accessory, so it can look off again even though you enabled it before.
Enable Geotagging for Photos and Videos
If your photos never show where they were taken, geotagging is likely turned off in the camera settings. Without it, the shot's location never gets written into the file's metadata, so gallery apps and map views cannot place the picture on a map later. This toggle sits directly in the camera app, separate from the general location settings.
Forget a Saved Wi-Fi Network
If your Oppo phone keeps reconnecting to an old Wi-Fi network with a wrong password or a router you no longer use, it is still sitting in the saved network list. ColorOS holds on to every network you have ever joined until you remove it yourself, which can cause slow reconnects or a jump to the wrong access point when two networks share a similar name.
Turn USB Tethering On or Off
If your laptop or tablet won't get online after you plug in your Oppo phone via USB cable, the internet connection usually is not shared yet. USB tethering has to be switched on manually before the connected device can use your mobile data.
Rename a Paired Bluetooth Device
When your Oppo phone's Bluetooth list fills up with entries like 'Speaker' or 'Headset-XYZ123', picking out the right device becomes a guessing game. ColorOS displays the broadcast name sent by the accessory itself, not a name you chose. Renaming the paired entry lets you tell devices apart at a glance, especially once you have several speakers, earbuds, or car systems saved.
Show Connection Speed in Status Bar
If you keep opening the data usage screen just to check how fast your connection is, Oppo can show that number right next to the signal icon instead. On Coloros this real-time network speed indicator is switched off by default, so the status bar only displays signal strength and battery. Turning it on adds a live Mbps or KB/s reading that updates while you browse or stream.
Personal Hotspot: Change Name, Password and Band
Your Oppo phone activates a personal hotspot with a generic name and a default password, which is fine for a quick test but risky for daily use. If you want other people to recognize your hotspot easily or you need a stronger password, you have to adjust these settings yourself.
Set Network Permissions per App
Some apps on your Oppo phone keep using mobile data even when you only want them online over WLAN, or the other way around. This happens because every app defaults to both mobile data and WLAN access unless you change it manually. Without a fix, background data usage climbs and apps may try to connect even when no WLAN network is nearby.
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.
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.
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.
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.
Turn Location (GPS) On or Off
When Smart Lock or Find My Mobile suddenly stops working on your Oppo phone, the location service is often the reason. Many apps also keep asking for GPS access even though you thought you had turned it off completely. Location tracking on ColorOS can be controlled system-wide or per app, and mixing up the two settings causes most of the confusion.
Select Network Manually
When you cross a border or travel abroad, your Oppo phone keeps searching for its home carrier and can end up on weak or costly foreign signal without you noticing. Automatic network selection ranks carriers by signal strength, not by cost or reliability, which causes dropped calls in border regions. Switching to manual selection lets you pick the exact carrier your phone connects to.
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.
Turn Screencast On or Off
If your Oppo screen does not show up on the Smart TV or another display, Screencast is often switched off or the target device is missing from the list of available receivers. Screencast mirrors your phone screen over the network, but it only works once the feature is enabled on the Oppo and the other device is discoverable. Without that active connection, nothing gets transmitted even if the TV is on and ready.