[Q] Voice and Simultaneous Data on Verizon topic

I have a Nexus 6, purchased directly from Motorola, running on the Verizon network. I recently flashed to factory image 5.1.0 (LMY47I), but am still unable to use data, i.e. browse the Internet and use Facebook, while using voice to talk on the phone. I thought that flashing to LMY47I would finally give me simultaneous voice and data, but that hasn't proved to be the case. How do I achieve simultaneous voice and data?