AT&T starts testing cross-carrier VoLTE calls

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In a blog post on Wednesday, AT&T said that it recently completed cross-carrier VoLTE phone calls in select areas. AT&T’s goal is to allow its subscribers to enjoy HD Voice audio and video calling when placing an VoLTE call to someone using another carrier. The nation’s second largest carrier and T-Mobile are both in the midst of such testing.

AT&T says that its VoLTE signal reaches 96% of its LTE coverage area. That works out to 295 million POPs. With 27 million of its active subscribers eligible to receive the carrier’s VoLTE signal, AT&T is ahead of the competition in …