iPhone cannot make or receive calls

Experiencing issues with receiving calls intermittently on your iPhone can be frustrating, but there could be various reasons for this problem. Here are some troubleshooting steps you can take to address the issue:

1. Make sure you have a strong cellular signal. Poor connectivity can lead to missed calls.
2. Ensure that you haven't accidentally turned on "Do Not Disturb" mode, which could prevent calls from coming through. This mode silences calls and notifications. You can find it in the Control Center or in the Settings app.
3. Make sure you're not in Airplane mode, as this disables cellular and Wi-Fi connections.
   1. 
4. Verify that you haven't set up call forwarding to another number. This could potentially route your incoming calls elsewhere.
5. If the problem persists, Reset Network Settings: Only network settings are removed.
   1. When you reset network settings, previously used networks and VPN settings that weren’t installed by a configuration profile or mobile device management (MDM) are removed. Wi-Fi is turned off and then back on, disconnecting you from any network you’re on. The Wi-Fi and Ask to Join Networks settings remain turned on.
   2. To remove VPN settings installed by a configuration profile, go to Settings > General > Profiles & Device Management, select the configuration profile, then tap Remove Profile. This also removes other settings and accounts provided by the profile. See Install or remove configuration profiles on iPhone in this guide.
   3. To remove network settings installed by MDM, go to Settings > General > Profiles & Device Management, select the management, then tap Remove Management. This also removes other settings and certificates provided by MDM. See “Mobile device management (MDM)” in the iOS Deployment Reference.
   4. Reset your Network Settings. Tap Settings > General > Reset > Reset Network Settings. This also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you've used before.
6. Check if you have accidentally blocked the contact or contacts that are trying to call you. Go to Settings > Phone > Call Blocking & Identification.
7. Carrier settings updates can also impact your phone's connectivity. Go to Settings > General > About. If an update is available, you'll be prompted to install it.
8. At times, the issue might be related to your carrier. Contact their customer support to check if there are any network-related problems.
9. Sometimes, a simple restart can resolve temporary software glitches. Turn off your iPhone, wait for a few seconds, and then turn it back on.
   1. Restart the device. That's it.
   2. Still not solved --> Force restart iPhone - Apple Support
10. If the issue persists, you can try resetting all settings on your iPhone. This will not erase your data but will reset all personalized settings to their default values. Go to Settings > General > Transfer & Reset > Reset > Reset All Settings and confirm the action. Note that you will need to reconfigure your settings afterward. All settings—including network settings, the keyboard dictionary, the Home screen layout, location settings, privacy settings, and Apple Pay cards—are removed or reset to their defaults. No data or media are deleted.
    1. Reset All Settings: Return iPhone settings to their defaults - Apple Support:- Return iPhone settings to their defaults
    2. You can return settings to their defaults without erasing your content.
    3. If you want to save your settings, back up your iPhone before returning them to their defaults. For example, if you’re trying to solve a problem but returning settings to their defaults doesn’t help, you might want to restore your previous settings from a backup.
11. Make sure you have the latest updates installed.
    1. Update Over-the-Air (OTA) —> Update your iPhone or iPad - Apple Support (IN)
    2. Update using iTunes/Finder —> Update your iPhone, iPad, or iPod touch - Apple Support (IN)

Contact Apple Support: If the problem persists, it might be a more complex issue that requires assistance from Apple's support team. You can reach out to them for further troubleshooting.

Check your iPhone settings

Go to Settings and turn on Airplane Mode, wait five seconds, then turn it off. Check Do Not Disturb. Go to Settings > Focus > Do Not Disturb and make sure it's turned off. Check for any blocked phone numbers.

If you can't make or receive calls on your iPhone - Apple Support

Can't send or receive message then try these steps first

1. Restart your device: ... 
2. Check your network connection. ... 
3. Check with your carrier to see if the type of message you're trying to send, like MMS or SMS, is supported.
4. If you're trying to send group MMS messages on an iPhone, go to Settings > Messages and turn on MMS Messaging.

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If you can't send or receive messages on your iPhone, iPad, or ...