Add an Alternate Calendar to the Calendar App
If the Calendar app only shows the standard Gregorian dates, you are missing a second date system next to the regular calendar view. OnePlus lets you display an alternate calendar such as Chinese, Simplified Chinese, Traditional, Hebrew or Hijri right below the main dates. The feature sits in a settings area that is easy to overlook on first use.
Create Contact Group
Sending the same text to five different chats or emailing your whole team one by one wastes time on a OnePlus phone. The Contacts app supports labels that bundle several people under one name, but the option to create one sits hidden inside the app's menu instead of its own tab. Without a label, group messages and group emails still mean picking every recipient manually.
Automatic Night Mode Schedule
If you keep forgetting to switch Night mode on in the evening or off again in the morning, manual toggling is the actual problem, not the feature. OnePlus lets you tie Night mode to a fixed time window or to sunset and sunrise, but the automation only works once the correct trigger rule is active. Pick the wrong option and the warm tint either stays on all day or never kicks in at night.
Set Calendar Event Colors by Category
When appointments from different Google Accounts, birthdays, and personal events all appear in the same shade, the Calendar app on your OnePlus gets hard to scan at a glance. Each event category can carry its own color, but the option sits inside the calendar settings and is easy to miss. Without it, a work meeting and a birthday reminder look identical in your day view.
Make Pattern Visible: Enable or Disable
If you use the Pattern unlock method on your OnePlus phone, the line you draw stays visible on screen while you enter it. Anyone standing close enough can watch the shape you trace and memorize your unlock pattern. This visible trail turns a private security feature into a risk for your personal data.
Unpair a Bluetooth Device
If a OnePlus phone keeps reconnecting to a Bluetooth speaker, inEars, or a laptop you no longer use, the old pairing entry is still sitting in the device list. That stored entry can grab audio playback automatically as soon as the other device is nearby and switched on. Removing the pairing clears the entry completely instead of just switching the connection off.
Show or Hide the Lockdown Option in the Power Menu
When you enable the Lockdown option, your OnePlus phone drops back to PIN or password entry the moment you tap it from the power button menu. Face Unlock, Fingerprint Scan and Smart Lock all get disabled instantly, which is handy for handing over the device or protecting it from unwanted access, but confusing if you never turned that toggle on yourself. Some users only notice the extra entry in their power menu and want to know where it came from or how to remove it again.
Dark or Light Theme for the Browser App
If the Chrome app on your OnePlus phone still shows a bright white page at night, the browser theme is probably set to follow the system or is stuck on light mode. A dark surface reduces glare and makes long reading sessions on the web easier on your eyes.
Rename a Contact Group
Typing errors creep in fast when you first set up group labels in the Contacts app, and a name that made sense last month can suddenly feel confusing. On OnePlus phones, a label used for calls and messages does not update on its own just because your contact list changed around it. Fixing the name only means finding the right spot in the label menu.
Change TalkBack Navigation Settings
Once TalkBack is running on your OnePlus phone, every tap and swipe controls the screen differently, and the default behavior does not always fit how you want to use the device. Single-tap activation and the context menu list decide how fast items get selected and how the options menu is displayed. Left on the wrong setting, the phone can feel unresponsive or the menu becomes hard to read.
Add a Contact Photo
If a contact shows up as a plain gray silhouette instead of a picture, incoming calls and texts on your OnePlus phone give you no visual clue about who is reaching out. That gets confusing fast when several contacts share a similar first name or when you are scrolling through a long list looking for someone.
Allow Phone Calls and SMS for Added Users
When you add a second user profile on a OnePlus phone, that account cannot make calls or send texts by default. The Phone and Messages apps stay locked until you switch on a specific permission for that profile. Once active, call logs and SMS threads become shared across every user on the device.
Switch Between 12- and 24-Hour Clock Format
When your OnePlus clock suddenly shows military time after setting up a new region, or you want the classic AM/PM display back on your lock screen, the format did not change by itself. OxygenOS ties the hour style to your selected region, so you need to switch it manually to get the display you are used to. Without this fix, every screen showing the time keeps the format tied to whatever region you picked during setup.
Select Network Automatically
If your OnePlus phone still shows a foreign carrier after a trip abroad, or displays no service while coverage should be fine, manual network selection is likely still switched on. This often happens after the phone registered with a local network abroad and never switched back to automatic mode.
Turn Bluetooth On or Off
If your OnePlus phone refuses to connect to earbuds, headphones or a speaker, Bluetooth is often simply switched off. Leaving the radio active when you are not using it also drains the battery faster than necessary and can trigger unwanted pairing prompts from nearby devices.
Reject an Incoming Call by Dragging the Handset Icon
If you just want a call to stop ringing without triggering the usual quick-reply text message, tapping and holding the handset icon is not the same as swiping to decline. On OnePlus phones, dragging the green icon downward ends the call silently, and what happens next depends entirely on your carrier's voicemail or call diversion setup, not on the phone itself. Many users mix this gesture up with the short-answer method and end up confused when no SMS is sent.
Connect via Wi-Fi Direct
Trying to send a photo or mirror your screen from your OnePlus to a Smart TV or Fire TV Stick only works if both devices can actually see each other over Wi-Fi Direct. If the target device never shows up in the list, Wi-Fi Direct is often still switched off on one side or the receiver is not in pairing mode. A stalled invitation usually points to the same cause.
Restrict Apps to Wi-Fi Only or Mobile Data
If Netflix, YouTube or another streaming app keeps eating through your mobile data plan even when you are near a router, it is likely still allowed to use mobile data in the background. OxygenOS lets you lock individual apps to Wi-Fi only, or the reverse, so they never touch your cellular connection again. This is separate from the general data saver toggle and works per app.
Set Up an APN Manually
If mobile data or MMS stops working right after you swap SIM cards, your OnePlus likely never received the correct Access Point Name. OxygenOS normally pulls these settings automatically from your carrier, but that handoff often fails with prepaid SIMs, MVNOs, or after a factory reset. The network bars still show a connection while data transfer silently fails in the background.
Show WiFi Password as QR Code
Typing out a long WiFi password for guests or family members gets old fast, especially with mixed-case letters and symbols. OnePlus phones can turn the saved network credentials into a scannable QR code instead. Anyone with a phone or tablet camera can then join the network without ever seeing or typing the actual password.
Add Trusted Devices to Smart Lock
If your OnePlus phone keeps locking itself even though a paired gadget is right next to it, Smart Lock's trusted device list might not include that accessory yet. Trusted devices work independently from trusted locations and rely on an active Bluetooth connection to keep the screen unlocked. Without pairing the accessory first, the option in Smart Lock stays unavailable.
Turn Off Wi-Fi Direct
Wi-Fi Direct on your OnePlus phone keeps running in the background even after a file transfer or screen mirroring session is finished. As long as one paired device stays linked, the feature does not switch off by itself and can quietly drain battery or block a new pairing attempt.
Disable Gmail Event Sync in Calendar
Booking a flight or a restaurant table on your OnePlus phone can suddenly add an extra appointment to your Calendar app that you never created manually. This happens because Gmail automatically forwards detected reservations and bookings as calendar events for every linked Google account. If you only want your own manually added appointments to show up, that automatic sync needs to be turned off.
Enable or Disable Google Backup
If your OnePlus phone stops uploading app data, contacts, and call history to Google Drive, you probably never checked whether Back up to Google Drive is actually turned on. This backup runs in the background and only keeps working while the toggle stays active, so a forgotten setting can mean silent data loss during a reset or device swap. Some people also switch it off on purpose to save mobile data or Drive storage without realizing what that costs them later.