why are my phone calls not going through?

best answer
support.apple.com › en-us › HT204027If you cant make or receive calls on your iPhone - Apple Support support.apple.com › en-us › HT204027 CachedCheck your iPhone settings. Turn Airplane Mode on and off. Go to Settings and turn on Airplane Mode wait five seconds then turn it off. Check your Do Not Disturb settings. Update your software. Check for a carrier settings update. Check for an iOS software update. Some updates might require a Wi-Fi connection. Remove and reinsert your SIM card. If your iPhone has a SIM card remove the SIM card then reinsert it. Contact your carrier. When you contact your carrier make sure that Your account is set up to use your iPhone. There arent any localized service outages.