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VoLTE winners and losers
AT&T said this week that it expects to have a voice-over-LTE (VoLTE) smartphone by the holidays, and Verizon has also said that it will launch a VoLTE phone this year. Analysts say the move to VoLTE will be gradual, and will definitely benefit some players more than others.Verizon vs. AT&T: The GSM advantage

Verizon Wireless and AT&T Mobility have both said they will turn on VoLTE during 2014, but AT&T has an advantage as a GSM carrier. “A 3GPP carrier like AT&T or T-Mobile can implement VoLTE market by market and it will play well with circuit switched voice,” said Roger Entner, lead analyst at Recon Analytics. “If you are a legacy CDMA provider you have to wait until your entire footprint is LTE before you can do VoLTE.” VoLTE is not backwards-compatible with CDMA, so a VoLTE call will drop if a Verizon subscriber loses an LTE…

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