Your iPhone might be unable to make calls if you’re running an outdated version of iOS. This is because phone calls are a software-based function, so bugs and glitches might prevent things from working properly.
Head to your iPhone’s Settings app, then open General > Software Update and tap “Download and Install” to update your device. You’ll need a Wi-Fi or mobile data connection, and it may take a while for the process to complete, depending on your internet speed.
You should also check for updates for your carrier settings, which ensure your iPhone’s ability to maintain a connection to your service provider’s network. However, carrier updates are released occasionally, and the only alert you get is a pop-up notification asking you to confirm the update.
There’s no dedicated section on your iPhone for manually updating carrier settings, but if you go to Settings > General > About, the pop-up will appear again if an update is available. Keep in mind that you’ll need an internet connection to be able to check for carrier settings updates.
You can scroll down to the Physical SIM, then check the information next to “Carrier” to see which version of your carrier settings your device is running. To make sure that is the most recent update, you can cross-check it on the website of your service provider.
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