Seeing a call fail on your OnePlus 13 Pro is a real nuisance, especially when you're trying to reach someone. This usually means your phone is having trouble connecting to your carrier's network properly. A weak signal, a minor software hiccup, or a setting that's out of place are the most likely culprits.
Let's run through the most effective ways to get your calls working again, starting with the quickest fixes you can try right now.
Toggle Airplane Mode On and Off
The fastest way to reset your cellular connection is by using Airplane Mode. This clears out any temporary network glitches that might be preventing calls from going through. Swipe down from the top of your screen to open the Quick Settings panel and tap the Airplane Mode icon to turn it on.
Wait about 15 seconds, then tap the icon again to turn it back off. Your phone will reconnect to the network, and you can try your call again. I'd start with this one, as it often does the trick in just a few seconds.
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 OnePlus 13 Pro's screen. If you only have one or two bars, try moving to a different location.
Sometimes just stepping near a window or going to a higher floor in a building can make a significant difference. If you see "No service" or an "X" over the signal icon, you're likely in a dead zone and will need to move to place with coverage.
Restart Your OnePlus 13 Pro
A simple restart can clear up many software-related issues that might be interfering with the phone app or network services. Press and hold the Power button until the power menu appears on screen, then tap "Restart."
If the screen is unresponsive, you can perform a force restart. Press and hold the Volume Down button and the Power button simultaneously for about 10 seconds until the device vibrates and the OnePlus logo appears. This is a soft reset that won't erase any of your data.
Review Your Focus and Do Not Disturb Settings
OxygenOS's Focus modes and Do Not Disturb can sometimes be configured to block all calls, or allow calls only from certain contacts. Swipe down from the top of your screen and look at the status bar for a moon icon or a specific Focus icon like "Work" or "Sleep."
If one is active, tap it to turn it off, or go to Settings > Sound & vibration > Do Not Disturb to check the rules. Make sure calls are not being silenced by these features.
Update Your Date and Time Settings
Believe it or not, incorrect date and time settings can cause authentication issues with cellular networks. The easiest fix is to let your phone set this automatically. Open Settings > Additional settings > Date & time.
Make sure the switch for "Use network-provided time" is turned on. This ensures your phone's clock is perfectly synced with your carrier's network.
Check Your Blocked Numbers List
It's worth a quick check to make sure you haven't accidentally blocked the number you're trying to reach. Open your Phone app and tap the three-dot menu in the top-right corner, then go to Settings > Blocked numbers.
Scroll through the list. If you find the number there, tap the "X" next to it to unblock. After that, try placing your call again.
Verify Cellular Data and Roaming Settings
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. Tap on your primary SIM card and make sure "Mobile data" is switched on.
If you're traveling outside your carrier's coverage area, you may also need to enable data roaming from this same menu. Just be aware of potential charges from your carrier before turning it on.
Update Your Carrier Settings
Your carrier occasionally sends out configuration updates that improve network connectivity and calling features. These usually install automatically, but it's good to check. Make sure you're connected to Wi-Fi first.
Then, go to Settings > About device > SIM status. Sometimes an update will be prompted here, or it may install silently in the background. Keeping these settings current helps avoid compatibility issues.
Temporarily Switch Off 5G
While 5G offers great speeds, in some areas with spotty coverage it can sometimes cause instability with voice calls. You can try forcing your OnePlus 13 Pro to use 4G/LTE instead for better call reliability. Go to Settings > Mobile network and select your SIM.
Tap "Preferred network type" and choose "4G/3G/2G (auto)" instead of the 5G option. Test to see if your calls connect more reliably. You can always switch it back to 5G later.
Inspect and Reseat Your SIM Card
A loose, dirty, or faulty SIM card is a classic cause of call failures. You'll need the SIM ejector tool that came with your phone. Gently insert it into the small hole on the SIM tray on the bottom edge of your OnePlus 13 Pro to pop the tray out.
Remove the SIM card, give the gold contacts a gentle wipe with a soft, dry cloth, and then reinsert it firmly into the tray. Push the tray back into the phone until it clicks. If you have access to another phone, testing your SIM card in it can help determine if the card itself is the problem.
Update OxygenOS Software
Software updates from OnePlus frequently include bug fixes for network and calling issues. It's always a good idea to be on the latest version. Connect your phone to a Wi-Fi network and make sure you have at least a 50% charge.
Then, go to Settings > About device > OxygenOS version and tap on the top banner that says "Check for update." If an update is available, follow the prompts to download and install it.
Reset Your Network Settings
This is a more thorough step that will clear all your saved Wi-Fi networks, Bluetooth pairings, and cellular network preferences. It won't delete your personal files, photos, or apps. Go to Settings > Additional settings > Backup & reset.
Tap on "Reset phone," then select "Reset Wi-Fi, mobile & Bluetooth." You'll need to enter your lock screen PIN or password to confirm. After the reset, you'll have to reconnect to Wi-Fi networks and re-pair Bluetooth devices, but it often resolves persistent calling problems.
Contact Your Mobile Carrier
If you've tried everything here and calls are still failing, the issue is likely on your carrier's end. There could be a network outage in your area, a problem with your account, or your SIM card may need to be replaced entirely.
Give your carrier's customer service a call from a different phone, if possible. They can check for outages, reprovision your line on their network, or send you a new SIM card. They can also verify if there are any specific network settings you need for the OnePlus 13 Pro on their service.