About 4G VOLTE
I have iphone 6s
i already activated 4G Volte a and set the VOLTE on the device but unable to show on the phone screen
hence request instruction pls
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2G, 3G, 4G, LTE, VoLTE, and 5G all are Carrier Specific features. Contact your Carrier (Cellular Service Provider), the agency that issued the SIM / eSIM to you.
However iPhone model specific feature is listed here --> Identify your iPhone model - Apple Support . and tap on "See the Technical Specs for Model XXXXXX" under each model and Scroll down to "Cellular and Wireless" section.