 This approach results in the voice service (control and media planes) being delivered as data flows within the LTE data bearer, with no dependency on (or ultimately, requirement for) the circuit-switched voice network to be in the call path.VoLTE has up to three times more voice and data capacity than older 3G UMTS and up to six times more than 2G GSM.It uses less bandwidth because VoLTE's packet headers are smaller than those of unoptimized VoIP/LTE.