was sent an sms saying till the end of the year, my phone needs to support volte

what does it mean for me if I dont have a volte phone?

what am I losing? new to understand this

I am not a big phone user. in fact I hate smartphones. the anti privacy issue with it. I hardly have apps on mine. dont surf, no social media, dont bank, no YT, dont game.

whatspp, as no choice. sms, phone. thats it.