Smartphones that support voice-over-LTE services have improved their battery efficiency in the four months since testing measurement company Spirent found that 4G calls drained handsets twice as fast as CDMA devices. In newer tests using MetroPCS' updated VoLTE service, Spirent said the batteries lasted 35% longer than in the initial test using a first-generation VoLTE device from LG, although 4G was still found to lag 2G when it comes to power efficiency.

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