In a joint press release today, AT&T and Verizon announced their voice over LTE (or VoLTE) interoperability plans for 2015. The companies say they are working to allow customers from the two carriers to make VoLTE calls between each of their networks.
Engineers from Verizon and AT&T have begun extensive testing in lab environments and then plan on moving to field trials. "This approach ensures customers will have a seamless experience making VoLTE HD Voice calls between networks," the release said.