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HD Voice: Fortschritte bei Sprachqualität zwischen O2 und Vodafone - WinFuture.de
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Vodafone's HD Voice launch leaves O2 customers as the odd ones out | Engadget
Artificial intelligence is set to handle O2 customer services from 2017 | The Independent | The Independent
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HD Voice: Fortschritte bei Sprachqualität zwischen O2 und Vodafone - WinFuture.de
Vodafone gets HD voice, makes callers sound human | Expert Reviews
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