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How to open VoLTE in telecom?

Thank you for using China Telecom. You can go to the local business hall for consultation. Secondly, you can do it yourself on your mobile phone: send the code of "ktVoLTE" to 1000 1 by SMS, then reply "y" to open it, and then enter "dual-card mobile network" in the mobile phone settings to open VoLTE's functional services.