I gave up my grandfather plan earlier this year. It was slightly more difficult because I only have one line and received a corporate discount. Monthly bill was about $95 and from a data perspective I was using an average of 15gb a month.
When at&t offered free Spotify, plus free Watch TV, with a mobile hot spot, high def video viewing, and unlimited everything else, I finally pulled the trigger. My corporate discount no longer applies, but my bill now is about $85 a month. Since that includes Spotify, that's another $10 savings. And while I don't really take advantage of Watch TV, it's nice when I do want to watch a few shows. Have yet to use the mobile hot spot, but we've also been in quarantine for months so there hasn't been much of an opportunity