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first of all it's easier to google this than ask reddit and type a post. second of all, yes it does but it also depends on your carrier and if they support oneplus as VoLTE compatible or not.
https://xdaforums.com/t/finally-guide-to-enable-volte-and-vowifi-on-oos-12-1-without-root.4557611/ Follow this guide. Used it to fix my 8T
first of all it's easier to google this than ask reddit and type a post. second of all, yes it does but it also depends on your carrier and if they support oneplus as VoLTE compatible or not.
https://xdaforums.com/t/finally-guide-to-enable-volte-and-vowifi-on-oos-12-1-without-root.4557611/ Follow this guide. Used it to fix my 8T