Verizon Wireless was on hand at Mobile World Congress to show off Voice-over-LTE. In case you didn't know, LTE is unable to access voice services at the moment. Verizon showed off the technology on the LG Revolution, one of the LTE devices coming to the network in mid-2011. It will be the first unit to support VoLTE when it launches. Aaron gets a live demo of the technology in action.