How do I enable power saving in calls?

[RadiantBeam]

cant do that in samsung apparently 

[cs_member10]

Dear Samsung Member,

Greetings from Samsung Customer Support!

As per your concern, we would request you to kindly perform the following steps by a given link to use Power saving mode on your device.

Power Saving mode link: https://www.samsung.com/in/support/mobile-devices/what-is-power-saving-mode-on-my-galaxy-phone/

However, If you have other concerns regarding Samsung products kindly feel free to get in touch with us.

Warm Regards,
Samsung Customer Support