How can I tell when HD Voice is being used in a phone call?
As far as i know, iPhone5 dont have HD voice indicator, i realised this when calling my dad with his Z10, he said there is HD Voice title on his Z10 answer button but there is no particular hd voice symbol or what so ever on my i5. Well, the voice quality with hd voice is just so clear and different, you should know whether hd voice is on or not just by voice quality.