103 operators in 49 countries are investing in VoLTE deployments, studies or trials, including 25 operators that have commercially launched HD voice service using VoLTE in 16 countries.
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 July 21, 2015.
For complete details per operator see the full Evolution to LTE report, which may also be downloaded from http://www.gsacom.com/gsm_3g/info_papers.php4
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