The company develops software for their phones such as the Vivo App Store, iManager included in their proprietary Android-based operating system called Funtouch OS. You will see the settings UI toggle off the "Enhanced 4G LTE Mode" setting, but this won't actually turn off the setting. It allows users to stay on the 4G network during voice calls. Please take a minute to fill up a short survey to help us improve your experience. If there is a VoLTE Call box shown, this means the phone is already supporting dtac 4G calling | VoLTE usage 3. Power Button + Volume Up Button (OR) Power Button + Volume Down Button. (1) Update your handset software: Step 1. If Developer Options is missing go to Settings > About Phone and tap on Build Number for about 7-10 times. When you see the Fast boot Mode, release all the Buttons. Users of popular 4G smartphones from brands such as Oppo, Vivo, Apple, Samsung, OnePlus, Nokia, Panasonic, Xiaomi, Karbonn, Lava can now make HD calls on Airtel VoLTE, the company said.
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