Verizon and ATT, the two largest mobile operators in the US, have spent the last couple years in a race to deploy next-generation voice technology known as Voice over LTE (VoLTE). With its announcement last week, ATT was the first to deploy the fast-speed VoIP network, but dont count Verizon out of the race quite just yet: executives explained to us today that its still on track for nationwide deployment sometime this year.