If you are worrying about radiation issue, yet you have the habit of needing to receive calls (due to work or personal reasons), you can consider enable WiFi calling. However this feature is applicable if your telco and your phone can support.
Yes, you are able to turn on Airplane mode and on WiFi, and make & receive call.
Lastly, I do not mean call from Whatsapp, social communication apps, but voice call.
