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How do I get VoLTE symbol in Redmi Note 3?
What if the VoLTE switch is not available in the SIM Cards & Mobile Networks settings?
If the VoLTE switch is not available in the SIM Cards & Mobile Networks settings, you can try updating your phone's software to the latest version. If that doesn't work, you may need to contact your mobile carrier to check if they have enabled VoLTE services for your SIM card.