Resend Undelivered Messages Automatically
If a text message shows a red exclamation mark or just sits there as 'Not delivered', your carrier connection likely dropped mid-send. OnePlus Messages can quietly retry it as SMS, but only if the resend behavior is configured the way you expect. Without checking this setting, you might be missing messages or getting asked for confirmation every single time a send fails.
Block Unidentified Callers Automatically
If your OnePlus keeps ringing for numbers with no caller ID or generic labels like Unknown, callers hiding behind a suppressed or unregistered number are getting through. This often includes robocalls or alleged competition and survey calls that never show a real number. A dedicated toggle in the Phone app can stop these calls before they reach you.
Enable or Disable Call Waiting
If a second call comes in while you are already on a call with your OnePlus phone, call waiting decides whether you get notified at all. Without it enabled, incoming calls during an active conversation go straight to a busy signal or voicemail. Some users also find the alert tone during calls distracting and want to turn it off entirely.
Add Emergency Contacts for SOS
If your phone is set to send its location during an SOS alert but nobody ever receives it, no emergency contact has been saved yet. OnePlus only sends the automatic SOS text with your current location to people you have added to a dedicated emergency list beforehand. Without that list, the alert has no recipient at all.
Enable or Disable Chat Features in Messages
If your OnePlus keeps showing typing indicators, read receipts or high-resolution photo sharing inside the stock Messages app, chat features are switched on and syncing over mobile data or Wi-Fi. Some users want this messenger-style behavior turned off because it reveals when a message was read or drains data in the background. Others find messages stuck on plain SMS because the toggle never got activated in the first place.
Copy Text from an SMS Message
An SMS with a delivery address, a phone number, or a one-time login code often needs to move somewhere else, like a notes app or a browser field. Retyping it risks a wrong digit, and OxygenOS does not show an obvious copy button in the conversation view. The option only appears once you select the message the right way.
Enable or Disable Hearing Aid Compatibility (HAC)
If your hearing aids pick up static, buzzing or a faint hum during calls on your OnePlus phone, the built-in audio output might not be tuned for hearing aid compatibility. This setting changes how the earpiece sends sound so hearing aids can pick up a cleaner signal, but it can also make calls sound different for people who don't use hearing aids. Getting this setting wrong in either direction leaves one group with poor call audio.
Add Contact to Favourites
Calling the same person over and over means scrolling through your whole contact list every time on your OnePlus phone. Marking that contact as a favourite pins it to the top of the Contacts app, so you skip the search entirely. It is a quick fix if you keep hunting for the same few names.
Reject Calls with a Quick Response Text
If your phone rings during a meeting or while you are driving, picking up is not always an option. On OnePlus phones you can decline the call and send a short text at the same moment, so the caller knows you saw it and will get back to them. The trick is finding the reply option before the call goes to voicemail.
Create a New Event in the Calendar App
Forgetting a meeting usually comes down to never adding it to the Calendar app in the first place. On OnePlus phones, new entries split into four types - Event, Task, Reminder or Goal - and picking the wrong one can leave out details you actually need, like location or repeat settings. Knowing which type to choose upfront saves you from redoing the entry later.
Delete a Calendar Event
If an appointment in the OnePlus Calendar app keeps showing up after you moved it, or it's simply no longer needed, you can remove it for good. Recurring events add an extra step, since OxygenOS asks whether to remove just one occurrence or the whole series. Picking the wrong option here can wipe out dates you still needed.
Merge Duplicate Contacts
If WhatsApp or another messenger keeps saving people you already have stored on your OnePlus, the same person often ends up listed twice. Calls, messages, and contact details then split across two separate entries instead of staying in one place, making the contacts list harder to search.
Enable or Disable Fixed Dialing Numbers
If your OnePlus phone suddenly blocks calls to numbers that are not on a specific list, Fixed Dialing Numbers (FDN) is probably active. This call restriction only allows contacts stored on the SIM card to be dialed, which many parents use to limit a child's phone to a few approved numbers. Turning FDN on or off always requires the PIN2 code from your carrier, not the regular SIM PIN.
Show or Hide Birthday Reminders in Calendar
If your OnePlus calendar suddenly stops showing a contact's birthday, a Google Account setting is usually behind it. Every linked account carries its own birthday visibility toggle, so one account displaying dates does not mean all of them do. A birthday that was visible last month can quietly vanish once a second account gets added.
Delete a Contact
Old numbers, duplicate entries, or contacts you no longer need can pile up in the Contacts app on your OnePlus phone. Deleting a contact removes every stored detail at once, including phone numbers, addresses, website entries, and birthdays. If that contact is linked to your Google Account, the deletion carries over there as well.
Edit a Contact
A wrong phone number or an outdated email on a saved contact can cause you to call or message the wrong person. On a OnePlus phone you can correct, add, or remove any contact detail at any time, without creating a duplicate entry. It does not matter whether you are fixing a typo, adding a new field, or clearing out old information.
Send an MMS with Photos or Videos
Trying to send a photo or video through the Messages app but the message behaves differently than a normal text? On a OnePlus phone, attaching a file automatically turns the conversation into an MMS, which depends on mobile data instead of just signal. Group chats, file size limits and carrier settings can all affect whether the attachment actually goes through.
Clear Call History
If your OnePlus call log is cluttered with old missed, dialed and received calls, deleting each entry one by one takes forever. The Phone app has a built-in option to wipe the entire history at once instead of managing every single call log entry manually.
Sort Contacts by First or Last Name
If your contact list on your OnePlus phone looks randomly ordered, the sorting setting probably does not match how the names were originally saved. Some contacts get stored with the first name first, others with the last name first, which throws off the alphabetical order you expect. A single setting in the Contacts app controls whether the list sorts by first name or last name.
Remove a Contact from a Group
If you remove a member from a group or label in the OnePlus Contacts app, it can look like the contact vanishes from your phone entirely. Only the group assignment is affected, the contact itself stays untouched. This distinction matters if you sort contacts into groups for calls or messages and want to avoid losing saved numbers by mistake.
View Call History for a Contact
Missing the full call log for one contact makes it hard to check how often you called, got called, or missed someone recently. On a OnePlus phone this history sits inside the contact's own call entry, not in a separate app or settings menu. Without opening the right screen you only see the last call, never the complete list of calls, dates and durations.
Export Contacts to VCF
OnePlus only lets you export contacts straight to a VCF file in internal storage, not directly to another app or cloud service. If you need those numbers on a new phone or backed up somewhere safe, you first have to pick the right account before the file gets created. Choosing the wrong account at that step often means the wrong contacts get exported, or none at all show up in the saved file.
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.
Sort Call List by First or Last Name
If contacts in your OnePlus call history seem to appear in the wrong order, the sort setting is often the cause. The Phone app lets you sort call list entries by first name or last name, independent of how the display name format is set. Mixing up these two settings is a common source of confusion.