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.
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.
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.
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.
Turn Off the Phone Completely
If calls and messages still come through on your OnePlus phone even after you enable Do Not Disturb or a rest mode, that is because these modes only silence alerts instead of shutting the device down. Many users assume Do Not Disturb or the concentration mode switches the phone off, but calls, background apps and the network connection keep running underneath. To stop calls and messages completely, the phone needs a proper shutdown, not just a quiet mode.
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.
Power Button Ends Call Setting
Struggling to tap the on-screen End call button during an active call on your OnePlus? A hidden accessibility option lets you hang up with the power button instead, but it only works once the right setting is turned on. Leave it off and pressing the power button just locks the screen while the call keeps running.
Change Calendar View
By default, the Calendar app on OnePlus phones opens with a combined overview of every added account, which makes it hard to see a full month at a glance. If you only need a quick daily rundown or a compact weekly plan instead, the current view setting is working against you. This applies to all accounts synced into the app, not just one calendar.
Add Members to a Contacts Group
A label or group in the OnePlus Contacts app stays empty until you actually assign people to it. Many users create a group but then struggle to find where to add contacts afterward, especially when they want to select several people at once instead of adding them one by one.
Delete a Single Text Message
Sometimes only one message in a long thread needs to disappear, not the entire conversation. On a OnePlus phone, the standard option to clear a whole chat removes far more than you actually want to get rid of. Deleting a single message only changes what you see on your own device, so the other person keeps their copy of it.
Change Default Messaging App
If your OnePlus keeps opening the stock Messages app instead of the messenger you actually installed, the phone is still pointing to the old default handler. Notifications, quick replies and even the share sheet stay tied to whichever app holds that role, no matter which one you prefer to type in. Switching the default only takes a moment, but the option sits a few menus deep in the system settings.
Call History Name Format Setting
If contacts in your call history show up as Last, First instead of First Last (or the other way around), it usually comes down to a display setting in the Phone app, not the contact entries themselves. This mix-up gets confusing fast when you are scanning recent calls for a specific person. The fix does not touch your saved contacts, only how names are displayed in the call list.
Dial Pad Tones: Enable or Disable
Every digit you tap on the OnePlus dial pad triggers a short tone, and that beep stays audible even with the ringer on silent. If you find the sound distracting in meetings or public places, the dial pad tone comes from a separate toggle that has nothing to do with your ringtone or notification sounds.
Enable or Disable Call Barring
If you are traveling abroad with your OnePlus and want to avoid unexpected roaming charges, call barring lets you block specific call types before they even connect. You can restrict outgoing calls, incoming calls, or international calls depending on which option you activate. Without the right setting enabled, calls still go through as usual and charges keep piling up.
Pairing Messages for Web with a PC
If you want to reply to texts without picking up your phone every time, pairing Messages with a browser tab on your PC solves that. The catch is that the phone still has to handle every message in the background, so the web session depends entirely on a working connection between the two devices. Many users get stuck at the QR code step because they open the wrong menu or use a browser that blocks the scanner.
Add a Contact Shortcut to the Home Screen
Digging through the Contacts app every time you want to reach the same person wastes time, especially if that contact is not one of your recent calls. On OnePlus phones, a home screen shortcut places that contact right next to your apps, one tap away. Here is what the Add to Home screen option actually does and when it is worth setting up.
Enable Parallel Apps for Dual Messenger Accounts
Running two WhatsApp, Messenger, Facebook or Instagram accounts on one OnePlus phone usually fails because the app only supports a single login at a time. OxygenOS solves this with a built-in cloning feature that creates a separate, independent copy of the app. Without it, you are stuck switching accounts manually every time you need the other profile.
Import Contacts from SIM or VCF File
Contacts stored only on a SIM card or in a .vcf backup file stay invisible to your OnePlus phone until you actively pull them into the Contacts app. That gap shows up right after switching SIM cards or setting up a new phone, when calls and messages suddenly miss names you know exist. Where you save the imported data - device storage or your Google account - also decides whether those contacts survive a factory reset or a phone swap.
Edit Quick Responses in the Phone App
Rejecting a call with a text reply on your OnePlus phone often sends a generic message like 'I will call you back later' that does not fit the situation. The Phone app stores a fixed set of quick responses that rarely match how you actually communicate. Until you edit them, every caller you decline gets the same default text.
Show or Hide Calendar Week Number
When you book a meeting or deadline, you often need the calendar week number, and the OnePlus Calendar app does not show it by default. That forces you to count weeks manually every time you check a date. The Show week number setting controls whether week numbers appear next to the days in your calendar view.
Set Dark or Light Theme for the Messages App
If the Messages app on your OnePlus phone still opens in a bright white layout at night, the built-in theme option is likely set to Light or System default instead of Dark. This app-level 'Choose theme' setting works independently from your phone's overall system theme, so changing one does not automatically change the other. Left on the wrong setting, this means unnecessary eye strain in dark rooms and slightly higher battery drain on an AMOLED screen.
Restart the Phone
If your OnePlus phone feels sluggish, apps stall in the background, or a fresh update refuses to finish installing, a restart usually clears the mess. Cache buildup and stuck background processes are the most common triggers. A quick restart resets these without touching your data.
Add a Birthday to a Contact
Birthdays entered on other phones or synced accounts do not always show up in a OnePlus contact card, especially when the Date field defaults to a different label like Anniversary. Without the correct field type, the birthday reminder never triggers in Calendar or the dialer app. This causes missed birthday notifications even though the date is technically saved somewhere in the contact.
Show or Hide Holidays in the Calendar App
If your OnePlus calendar shows a public holiday on almost every day, actual appointments get pushed down and easy to miss. This happens because the calendar app displays regional and national holidays by default, on top of every synced account. The more accounts you have connected, the more crowded the day view becomes.