90 operators in 47 countries are investing in VoLTE deployments, studies or trials, including 16 operators who commercially launched HD voice service using VoLTE.
Download the list of all VoLTE system investments (deployments, launches, trials, studies) in this short document, which is an extract from the Evolution to LTE report published on April 9, 2015.
For full details per operator see the full Evolution to LTE report, which may also be downloaded from https://www.gsacom.com/gsm_3g/info_papers.php4
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