Hot on the heels of Verizon's completion of a test call using voice over LTE on its LG Revolution, the word on the street is that MetroPCS is hooking up with none other than HTC for its own VoLTE-capable phone -- though it's not MetroPCS making the announcement: instead, the GSM Association's technology director broke the news, which was followed by a swift "no comment" from the carrier itself. As PCMag points out, there's a sense of urgency for MetroPCS to deploy VoLTE in short order because it's using AWS bandwidth for