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There's something called 'Enhanced HD Voice' and EE supports it
Most weirdos people that actually use their smartphones to make calls will be aware of the eerily crisp connections of HD Voice. All major carriers in the UK support the standard at this point, which is technically known as Voice over LTE (VoLTE), since 4G frequencies are responsible for the improved call clarity. But apparently, there's something better. It's called Enhanced HD Voice, and EE is today boasting it's the first network in the UK to support it.