My phone keep cutting of while I'm on a call

Hello rosalee261,

When your iPhone is powering off unexpectedly, first make sure that your device has the latest version of iOS and that your apps are up to date:

Update your iPhone or iPad - Apple Support

How to manually update apps on your Apple device - Apple Support

This way, any available fixes are in place. Then, check your battery's health, as a battery in poor condition can cause the iPhone to not be able to supply the power it needs. You can find this information in Settings > Battery > Battery Health (with iOS 16.1 or later, find these in Settings > Battery > Battery Health & Charging).

Cheers!