I'm currently on the "Play More Unlimited" plan with an iPhone XS and trying to use personal hotspot to get online on my Late 2013 15" Retina MacBook Pro. Getting hotspot speeds no more than 0.7 Mbps on my laptop and i'm well within the first 15GB of Unlimited 4G LTE speeds allowed for hotspot usage on my current plan. Here's are the Speedtest Results.