Airplane mode doesn’t work

When you activate Airplane Mode on your iPhone 13, it disconnects cellular connections, but it doesn't disable Wi-Fi. So, even in Airplane Mode, you can still make and receive Wi-Fi calls, as this feature operates independently of cellular networks. Enabling Wi-Fi while in Airplane Mode allows you to stay connected to Wi-Fi networks, letting you receive messages from social networking apps and make calls over Wi-Fi. This behavior might seem surprising, but it's designed to ensure you can use your phone's internet capabilities while airborne without interfering with the aircraft's communication systems.

JezPage1 wrote:

(which im generally not a fan of btw),

iOS updates generally aim to enhance user experience, boost security, and fix bugs rather than disrupt core features. Receiving Calls issues after updates might stem from underlying, unmentioned factors. Updates won't typically alter personal data but may refine settings or features. Backup before major updates for safety. Review Apple's update details and backup advice for a smooth process.

This seems purely coincidental so please check the Setting on your device.

See what each update does: About iOS 17 Updates, About iOS 16 Updates, About iOS 15 Updates, About iOS 14 Updates, About iOS 13 Updates, About iOS 12 Updates, and so on...