While using a Verizon 4G-LTE hotspot at the Control site, I got comments that my CW turned into random garbage now and then.  A Wifi speed test showed the down speed about 8 Mbps, and the up 0.25 Mbps or worse.  Not good.  I was able to get a prepaid Comcast service that remained at 20 Mbps down and 1.0 up.  Not very impressive numbers, but it has worked perfectly on CW, FT-8, and SSB.  (K3, K3/0 mini).
Chuck, N8CL