If I planned my life around it, I could live without voice and texting, and rely on instant messaging and Email instead, however I must have LTE. I can't rely on WI-FI everywhere. So, I would be paying some cellular service for LTE, and then I might as well get voice/text.
That said, I just noticed T-Mobile $30/month 100 minute voice, and unlimited data (4G up until 5GB) plan. That's pretty amazing and I will probably jump ship from Verizon.
Actually, even if you are a cab driver, GPS + offline maps are completely free.