How to enable VoLTE (HD voice) for flyme 6.1.0.0G(stable version) update?

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2017-08-02 01:06

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The VoLTE toggle button was removed for flyme 6.1.0.0G update. How to enable HD voice or VoLTE for this new update? Please reply quick about the alternative solution. I couldn't make any calls now ???? Am using Jio 4G voice app and i should leave the mobile data turned on all the time for recieving calls. Am so sucked with this update????