I'm paying ~$125/month for unlimited data and hotspot with 450 minutes and 1000 messages. My work phone (the only phone number anyone has for me) has an AT&T UDP including tethering and unlimited talk/text (technically the company shares an enormous pool of data but for all intents and purposes, it's unlimited). I almost exclusively use my Verizon phone for tethering (about 25 - 30 GB a month), but I could curtail that if I used my work phone for data more. It would save me about $40/month. Now that I'm thinking about it, I could really just cancel the Verizon line and only use my work phone, but I've held on to the UDP for security.
It's just SO hard to give up TRULY unlimited data, even at $125/month.