Verizon may roll out Voice-over-LTE (VoLTE) in early 2013. Citing industry sources, Light Reading Mobile claims that VerizonÃs VoLTE service will go live nationwide next year and that it has been successfully trialing an IP Multimedia Subsystem (IMS)-based app in two markets. Verizon had originally hoped to launch the service in 2012, although if it begins its roll out before the end of the year, it may be in limited markets.