Getting a "Call Failed" message on your Nothing Phone (2) can stop you in your tracks. This usually means your phone is having trouble connecting to your carrier's network properly. It's often a quick fix related to your signal, a software hiccup, or a simple setting.
Let's start with the fastest solution that often clears things up in seconds.
Toggle Airplane Mode
The quickest way to reset your cellular connection is to use Airplane Mode. This forces your phone to reconnect to the network from scratch, which can clear temporary glitches.
Swipe down from the top of your screen to open the Quick Settings panel. Tap the airplane icon to turn Airplane Mode on. Wait about 10 seconds, then tap it again to turn it off. Check your signal bars in the status bar to see if they return.
Check Your Signal Strength
Weak signal is the most common culprit for failed calls. Look at the signal indicator in the top-right corner of your Nothing Phone (2). If you only have one bar or see an "X," you're in a poor coverage area.
Try moving to a different room, near a window, or even stepping outside. The Snapdragon 8+ Gen 1 modem is capable, but it can't work without a signal. If you're indoors, building materials can significantly weaken reception.
Force Restart Your Phone
A simple reboot can fix a surprising number of software-related calling issues. On the Nothing Phone (2), you force restart by pressing and holding the power button on the right side for about 10 seconds.
Keep holding it until you see the screen go black and the Nothing logo reappear. This is different from just turning the screen off and on, and it gives the system a fresh start.
Review Focus Mode and Sound Settings
Nothing OS includes Focus modes that can silence notifications. Double-check that you haven't accidentally set a mode that's blocking calls. Swipe down and check the Quick Settings for any active Focus icons.
Also, take a quick look in Settings > Sound & vibration. Ensure your ringtone volume is turned up and not set to vibrate only for calls.
Update Your Date, Time, and Carrier Services
Incorrect system time can sometimes interfere with network authentication. Go to Settings > System > Date & time and make sure "Use network-provided time" is switched on.
While you're in system settings, it's a good idea to check for carrier services updates. Go to Settings > System > System update. Sometimes, carrier-specific updates that improve calling reliability are delivered this way, not through the Play Store.
Check for Blocked Numbers
It's worth verifying 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.
Go to Settings > Blocked numbers. If the number is listed, you can tap it and select "Unblock." This is a simple step that's easy to overlook.
Verify Mobile Data and Network Settings
Ensure your mobile data is enabled, especially if you're trying to use Wi-Fi Calling. Go to Settings > Network & internet > Internet. Tap the settings icon next to your SIM and make sure "Mobile data" is turned on.
If you're traveling, you might need to enable data roaming in the same menu. Be cautious, as roaming charges may apply.
Try Switching Network Modes
Sometimes, the 5G or 4G LTE connection can be unstable for voice calls. You can try forcing your phone to use an older, but often more reliable, network type like 3G.
Go to Settings > Network & internet > SIMs. Tap on your SIM card and then select Preferred network type. Try switching from "5G" to "4G" or even "3G" temporarily. Make a test call, then switch it back to your preferred mode.
Inspect 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 Nothing Phone (2). Insert it into the small hole on the left side of the phone's frame to pop out the tray.
Carefully remove the SIM card, gently wipe the gold contacts with a soft, dry cloth, and reinsert it. Make sure it's seated correctly in the tray before sliding it back into the phone.
Update Nothing OS and Your Apps
Software updates frequently include fixes for connectivity bugs. Make sure your Nothing Phone (2) is running the latest version of Nothing OS.
Go to Settings > System > System update to check. Also, open the Google Play Store, tap your profile icon, and go to "Manage apps & device" to update all your apps, including the Phone and Carrier Services apps.
Reset Your Network Settings
This is a more thorough step that will erase all your saved Wi-Fi networks, Bluetooth pairings, and cellular network preferences. It won't delete your personal data like photos or messages.
To do this, navigate to Settings > System > Reset options. Tap on "Reset Wi-Fi, mobile & Bluetooth." You'll need to enter your PIN or password to confirm. After the reset, you'll have to reconnect to Wi-Fi and re-pair Bluetooth devices.
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 temporary network outage in your area, a problem with your account, or your SIM card may need replacing.
Give your carrier's customer service a call from another phone if possible. They can check for outages, reprovision your line on their network, or send you a new SIM card. They can also confirm if your Nothing Phone (2) is properly configured for their network services.