Having your OnePlus Nord 4 drop calls mid-conversation is incredibly annoying. It's usually a sign that the connection to your carrier's network has become unstable. This can be due to a weak signal, a software hiccup in OxygenOS, or even a problem with your SIM card.
Let's run through the most effective fixes, starting with the quickest ones you can try right now.
Toggle Airplane Mode On and Off
This is the fastest way to refresh your cellular connection. 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 clears up temporary glitches causing the drops.
Check Your Signal Strength
Look at the signal bars in the top-right corner of your Nord 4's screen. If you're seeing one bar or the dreaded "No Service" icon, you're likely in a poor coverage area.
Try moving to a different room, near a window, or even stepping outside. The metal unibody, while great for build quality, can sometimes slightly impact signal compared to plastic or glass backs if you're in a very weak zone.
Perform a Force Restart
A simple reboot can clear out software gremlins. Just press and hold the Power button on the right side of your Nord 4 for about 10 seconds, or until you feel it vibrate and see the OnePlus logo appear.
This forces the phone to shut down and start fresh, which can resolve many temporary issues in OxygenOS 14.
Disable Wi-Fi Calling Temporarily
While Wi-Fi Calling is great for coverage indoors, a shaky Wi-Fi network can actually cause call drops. It's worth turning it off to see if your calls stabilize on the pure cellular network.
Go to Settings > Mobile network > Wi-Fi Calling and toggle it off. Make a test call to see if the problem persists.
Update Your Phone and Carrier Services
OnePlus regularly releases updates that fix bugs, including network-related ones. Make sure your Nord 4 is running the latest software.
Head to Settings > About device > OxygenOS version to check for an update. Also, open the Google Play Store, tap your profile icon, and go to Manage apps & device > Updates available to see if "Carrier Services" has an update.
Reinsert Your SIM Card
A SIM card that's not seated perfectly can lead to an intermittent connection. Grab the SIM ejector tool that came in the box (or a small paperclip) and gently push it into the tiny hole on the left side of the phone.
Pull out the tray, remove the SIM card, and give the gold contacts a quick wipe with a soft, dry cloth. Then reinsert it firmly and push the tray back in.
Switch Between 4G and 5G
If you're in an area with spotty 5G coverage, your phone might struggle to maintain a stable call while hopping between network types. You can force it to use 4G, which is often more reliable for voice calls.
Navigate to Settings > Mobile network > Select preferred network type. Choose "4G/3G/2G (auto)" instead of "5G/4G/3G/2G (auto)" and see if your call quality improves.
Reset Your Network Settings
This will erase all your saved Wi-Fi networks, Bluetooth pairings, and cellular settings back to default. It's a strong fix for persistent network problems without touching your personal data like photos or messages.
Go to Settings > Additional settings > Backup & reset > Reset phone > Reset network settings. Tap to confirm, and your phone will reboot. You'll just need to reconnect to Wi-Fi and re-pair Bluetooth devices afterward.
Check for App Conflicts in Safe Mode
A recently installed app could be interfering with your phone's radio functions. Booting into Safe Mode temporarily disables all third-party apps.
Press and hold the Power button until the power menu appears. Then, tap and hold the "Power off" option on your screen until you see a prompt to reboot to Safe Mode. Tap "OK".
If your calls don't drop in Safe Mode, a downloaded app is likely the culprit. You'll need to uninstall apps one by one, starting with the most recent, to find the offender.
Contact Your Mobile Carrier
If you've tried everything here and calls are still dropping, the issue might be on your carrier's end. There could be local network maintenance, a tower issue, or even a problem with your account provisioning.
Give their customer service a call from a different phone if possible. Ask them to check for outages in your area, verify your line is properly configured for HD Voice or VoLTE, and request a new SIM card if they think yours might be faulty.