The Call recording feature can vary depending on your phone model, country or region, and SIM card carrier support. Normally, the Call recording icon should appear within the Google Phone APP when making or receiving calls. Simply tapping this icon should allow you to record the conversation.
However, if you do not see the call recording icon, it is possible that your device model, region, or mobile carrier does not support this feature. Some countries have restrictions on call recording due to privacy laws and regulations, and certain carriers will disable this function. Please check with your carrier or review your local laws regarding call recording.