Enable or Disable Call Forwarding
If missed calls keep landing in your carrier's voicemail instead of a number you actually check, call forwarding is probably set to a default option you never chose. On a dual SIM OnePlus phone this setting exists separately for each SIM, so calls to one number might forward while the other stays untouched. Some carriers also split forwarding rules into busy, unreachable, and no-answer cases, which explains why calls sometimes reach you and sometimes do not.
Change the Default Browser App
If tapping a link on your OnePlus always launches Chrome even though you installed Firefox or Opera, the system has not switched the default assignment yet. Each browser app handles tabs, bookmarks and privacy controls differently, so staying on the wrong one limits how you personalize browsing. The active default only changes once you select it inside the phone's app settings.
Set a Lock Screen Message
If your OnePlus gets lost, whoever finds it has no way to reach you unless your name or contact info shows up before the device unlocks. The lock screen normally only displays the time and notifications, nothing personal. A short custom line on the Ambient display can close that gap.
Add a Second User Account
If you share your OnePlus phone with a family member or colleague, mixing personal apps, messages and login data quickly becomes a hassle. A separate user profile keeps each person's home screen, apps and app data apart, while things like Wi-Fi settings still stay shared across the device.
Clear App Data
If an app on your OnePlus keeps crashing, freezing, or showing broken content even after you cleared its cache, the stored app data itself is likely corrupted. Clearing app data removes saved settings, sign-in sessions, and local files, resetting the app to its original state. Any information not backed up separately is lost once you confirm the reset.
Empty the Recycle Bin in Gallery
Deleted photos and videos on OnePlus phones sit in the Recently deleted folder for 30 days before they disappear automatically. If storage keeps filling up despite deleting files, that hidden folder is often the reason. Clearing it manually frees up space right away.
Enable or Disable SIM Card Lock
Enter the wrong SIM PIN three times and OnePlus locks the card, asking for the PUK code from your carrier instead of the PIN. Some people also want to turn this protection off entirely so a restart never asks for a PIN again. Both changes sit in the same security setting, and mixing them up can lock the SIM completely.
Enable or Disable Double Tap to Wake
If your OnePlus screen stays black no matter how many times you tap it, or it lights up every time your phone brushes against something in your pocket, the Double tap to wake gesture is likely set the wrong way. This function skips the power button entirely and wakes the display straight from a locked or idle state. Getting the toggle wrong either leaves you stuck reaching for the power button every time, or drains battery with accidental wake-ups.
Lock Screen Notification Display Options
If your OnePlus lock screen shows full message previews and app icons for anyone standing next to you, private content can leak before the phone is even unlocked. Oxygen OS lets you dial that down, from full notification text to nothing at all. Pick the wrong option and you either expose messages on the lock screen or miss alerts you actually wanted to catch.
Enable or Disable Contact Suggestions
When you fill out a form or type a message, Gboard sometimes suggests a name, phone number, or email address pulled straight from your contacts. That can save time, but it also means personal contact data shows up above the keyboard without you asking for it. If that feels intrusive or the suggestions keep getting in the way while typing, the setting behind this behavior can be switched off.
Turn Off Personalized Ads
Your OnePlus advertising ID lets ad networks build a profile from your browsing history and app usage, then match banners and pop-ups to your interests. Some users notice ads that feel too specific to searches or sites they visited recently. Turning off personalization does not remove ads, it only stops OnePlus from tailoring them to your activity.
Turn Emergency Alerts On or Off
If your OnePlus phone keeps buzzing with AMBER Alerts or extreme threat warnings you never signed up for, the culprit is the built-in emergency alert system, not a third-party app. Each alert category, plus its ringtone and vibration, can be controlled on its own, so you do not have to mute everything at once.
Show or Hide Caller ID
When you call someone from your OnePlus, your number usually shows up on their screen by default, following whatever your carrier has set. If you want to call without revealing your number, that behavior sits in a setting most people never touch. On Dual SIM phones, each SIM handles this separately, so the wrong card can leave you exposed even after you think you have hidden your number.
Enable or Disable Three-Finger Screenshot
Taking a screenshot on your OnePlus normally means pressing Volume down and the Power button at the same time, which is fiddly with one hand or when a case covers the buttons. The Three-finger screenshot gesture offers an alternative by swiping down across the screen with three fingers. If that swipe suddenly stops working, or triggers by accident while gaming, the setting behind it usually needs a quick check.
Set Preferred Network Type (2G/3G/4G)
If your OnePlus keeps losing signal or drains battery fast in a weak 4G area, the modem is likely stuck hunting between network generations. By default the preferred network type is set to search automatically across 2G, 3G and 4G for the best possible connection. In patchy coverage zones that automatic switching can cause dropped calls, slow data or extra battery drain, and locking the phone to a lower or single network mode often gives a more stable result.
Enable or Disable Bluetooth Tethering
Sharing your OnePlus phone's mobile data over USB or a Wi-Fi hotspot drains the battery fast or needs a cable you do not always have on hand. Bluetooth tethering lets a laptop, tablet, or second phone use your connection with far less power draw, but the toggle sits buried inside the hotspot settings and is often switched off by default.
Enable or Disable USB Debugging
If MyPhoneExplorer, ADB, or a custom-ROM installer does not recognize your OnePlus phone, USB debugging is usually the missing piece. This function sits inside Developer options and stays hidden by default, which is why many users cannot find the toggle at all.
Enable or Disable Reading Mode
If your OnePlus screen still feels harsh on the eyes at night, or photos and videos look washed out during the day, Reading mode is probably set the wrong way for how you use the phone. This feature swaps cool blue tones for warmer colors to ease eye strain, but picking the wrong effect can leave images looking flat or overly warm. Switching between Chromatic effect and Mono effect changes how much color stays visible while reading.
Enable or Disable Auto Sign-in for Saved Passwords
If Chrome logs you into a website the moment it loads, without ever asking for a password, Auto sign-in is likely active on your OnePlus phone. It uses account names and passwords stored in the browser to skip manual entry completely. That is convenient, but anyone who picks up your unlocked phone gets the same instant access to those accounts.
Set a Custom Ringtone
If your OnePlus phone only offers preset tones for incoming calls, you cannot pick a personal mp3 track by default. Custom sounds only show up in the ringtone picker once the file sits in the right storage location, and Dual SIM setups add another layer if each SIM should ring with its own tone.
Enable or Disable Google Play Protect
If Google Play Protect keeps flagging apps you trust, or you cannot install an APK because the scan blocks it, the built-in protection is doing exactly what it is designed for. On the other hand, if scans slow down installs or you rely on a different security app, you might want to turn the feature off. Either way, the setting sits inside your security options and controls how OnePlus checks every app you download.
Change Home Screen Wallpaper
If you skipped the wallpaper prompt during initial OnePlus setup, the home screen keeps whatever default image OxygenOS assigned. Many owners only notice later that the pre-installed wallpapers do not match their style and want to use their own photo instead. The setting is not always obvious once the setup wizard is finished.
Switch Automatically Between Wi-Fi and Mobile Data
If your OnePlus stays connected to a weak or dropping Wi-Fi network instead of falling back to mobile data, video calls stutter and pages fail to load even though your data plan is active. This happens because the Intelligent network connection feature, which lets your phone hop onto mobile data during unstable Wi-Fi, is turned off by default. Once you know where to find it, fixing the constant buffering takes less than a minute.
Set Dark or Light Theme for the Phone App
If the Phone app on your OnePlus always follows the system theme, calls and the dialer can look too bright at night or too dull during the day. You can override this and lock in a fixed light or dark look just for the phone app instead of tying it to the general Android theme setting. The dark option also eases strain on your eyes and can trim battery use on OLED screens.