Seeing a call fail on your OnePlus 13 is a real nuisance, especially when you're trying to reach someone important. This usually means your phone is having trouble connecting to your carrier's network properly. Weak signal, a minor software hiccup in OxygenOS, or a simple setting can often be the culprit.
Here are 10 effective ways to fix those dropped or failed calls on your OnePlus 13, starting with the quickest solutions you can try right now.
Toggle Airplane Mode
The fastest way to reset your cellular connection is by using Airplane Mode. This clears out any temporary network glitches that might be preventing your calls from going through.
Swipe down from the top of your screen to open the Quick Settings panel. Tap the Airplane Mode icon to turn it on, wait about 10 seconds, and then tap it again to turn it off. Your phone will reconnect to the network, which often solves the problem immediately.
Check Your Signal Strength
Weak cellular signal is the single most common reason for call failures. Take a look at the signal bars in the top-right corner of your screen. If you only have one bar or see an "X," you're likely in a poor coverage area.
Try moving to a different location, stepping near a window, or going outside. I've found that even a small change in position can make a big difference with signal reception on modern phones.
Restart Your OnePlus 13
A simple restart can clear up many minor software-related issues that might be affecting your phone app or network services. Just press and hold the Power button until the power menu appears, then tap "Restart."
If your screen is unresponsive, you can perform a force restart. Press and hold the Volume Down button and the Power button together for about 10 seconds until the device vibrates and the OnePlus logo appears.
Check Focus and Do Not Disturb Modes
Your Focus modes or Do Not Disturb settings might be inadvertently blocking calls. Swipe down from the top to check your Quick Settings tiles. If you see a moon icon or a specific Focus mode like "Work" is active, tap it to turn it off.
You can also go into Settings > Sound & vibration > Do Not Disturb to make sure no rules are set to silence calls from everyone or your contacts.
Update Date, Time, and Network Settings
Incorrect date and time settings can sometimes cause conflicts with network authentication. It's best to set these automatically. Go to Settings > Additional settings > Date & time and make sure "Use network-provided time" is switched on.
While you're there, you can also check for a carrier settings update. Go to Settings > About device > Status > SIM status. Sometimes, being on this screen can trigger your phone to check for and apply a small carrier update from your provider.
Review Your Blocked Numbers List
It's worth a quick check to make sure you haven't accidentally blocked the number you're trying to call. Open your Phone app, tap the three-dot menu in the top-right corner, and go to Settings > Blocked numbers.
If the number is listed there, you can tap the "X" next to it to unblock. This is a simple fix that's easy to overlook.
Verify Mobile Data and Network Preferences
Ensure your mobile data is enabled, especially if you're trying to make a call over VoLTE (Voice over LTE). Go to Settings > Mobile network and make sure "Mobile data" is turned on.
You can also try switching your preferred network type. In the same menu, tap on your SIM card and then Preferred network type. If you're on "5G," try switching to "4G/3G/2G" temporarily to see if the call connects more reliably, then switch back.
Check and Reinsert Your SIM Card
A loose, dirty, or faulty SIM card is a classic cause of call failures. Use the SIM ejector tool that came with your phone to pop out the tray. Carefully remove the SIM card, give the gold contacts a gentle wipe with a soft, dry cloth, and then reinsert it firmly.
If you have access to another phone, try your SIM card in that device to see if calls work. If they do, the issue is with your OnePlus 13. If they don't, you may need a replacement SIM from your carrier.
Update Your OxygenOS Software
Software updates frequently include bug fixes for network and calling stability. Early builds of OxygenOS 15, in particular, might have had some kinks to work out. Connect to Wi-Fi, make sure your battery is above 30%, and go to Settings > About device > OxygenOS version > Check for update.
Download and install any available updates. This is one of the most effective ways to resolve persistent software-related calling issues.
Reset Your Network Settings
If calls are still failing, resetting your network settings can be a powerful fix. This will erase all saved Wi-Fi networks, Bluetooth pairings, and cellular network preferences, but it won't touch your personal data like photos or messages.
Go to Settings > Additional settings > Backup & reset > Reset phone > Reset network settings. Tap to confirm, enter your lock screen password if prompted, and your phone will reboot. You'll then need to reconnect to Wi-Fi and re-pair Bluetooth devices, but it often clears up stubborn network problems.