While transitioning to an all-LTE telecommunications model might seem as easy as flipping a switch, there is still plenty of work to be done before networks like Verizon and AT&T move away from 3G for placing voice calls. A key problem has been the ability successfully switch between the 4G LTE network and a 3G network mid call, a capability that will be especially important during the initial rollout of VoLTE (voice-over-LTE).
Android Phone, Qualcomm chip completes successful voice call handover from LTE to WCDMA
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