HD Voice: Fortschritte bei Sprachqualität zwischen O2 und Vodafone
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![MICHAEL JACKSON'S THIS IS IT | LIVE AT O2 ARENA, LONDON, MAR 6th, 2010 (LAST SHOW) [MJJ'sSC FANMADE] - YouTube](https://i.ytimg.com/vi/xHnNTOZ3AiE/sddefault.jpg "MICHAEL JACKSON'S THIS IS IT | LIVE AT O2 ARENA, LONDON, MAR 6th, 2010 (LAST SHOW) [MJJ'sSC FANMADE] - YouTube")
MICHAEL JACKSON'S THIS IS IT | LIVE AT O2 ARENA, LONDON, MAR 6th, 2010 (LAST SHOW) [MJJ'sSC FANMADE] - YouTube
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HD Voice: Fortschritte bei Sprachqualität zwischen O2 und Vodafone
What is HD Voice? And why is phone call quality so bad?
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