I also tried it once before. As a T-Mobile phone subscriber, I got it for $30 per month with bank withdrawal payments. I worked fine, but intermittent dropouts. I used it to shame Spectrum into fixing my house entry cables. But Spectrum kept having dropouts randomly during important Zoom sessions. And during power failures, my home equipment was backed up by me, but their system distribution amps were not.
I reordered The Tmobile box, and hooked up an external Waveform antenna. Holy crap! Solid 400 to 700 downloads and up to 100 uploads. I back it up at home with UPS, and the cell tower seems to have UPS as well. No more glitches, TV speeds good for 8K and instant response on phones and computers. Oh, and I got the grandfathered $30 /mo rate lock just in time. Combined with YouTube TV for $73 /mo and I am all in for under $100 per month. Yes, I am totally happy!