What are you talking about? "Simultaneous voice and data". I use that all the time on my 2 year old iPhone4... ???
Get up to speed. On CDMA/LTE networks (like Verizon), iPhone 5 does not do simultaneous voice and data. On GSM/LTE networks it does both but it's not LTE data either as the phones switches to 3G. Android phones on Verizon do 4G data and voice simultaneously.