( with T-Mobile) I had to stand outside in fucking Minnesota 1 mile from the State fucking Capitol in 2014 for reception on important calls...When i let my Viet gf and family harang me about " it's cheaper its cheaper" ( grandfathered in with ATT Unlinited plan)
I switched, and regretted it inside of a week.....
Then I took a job in the Northwoods of Wisconny and there was zero Tmobile connection off the main highway, everybody up there was switching to Verizon, because they had bought up another carriers towers and were building out their network...( maybe US Cellular)
SO dumped that T-mobile phone for a verizon and never looked back
Yeah, I tried getting ipv6 failover working a few times, and without static ipv6 blocks, it just isn't happening. Hopefully there is something that can be done in the future, but its not the end of the world
My primary is AT&T Fiber which is 1Gb symmetrical, that's why the latency is so good
FWIW... I woke up this morning and (like I'm prone to doing for whatever reason), I checked and saw that I was on both lower speed bands for T-Mobile B66/N71. I've learned from experience that a quick (well, two minute) cold boot will get me back to the good bands right away. That said, even on B66/N71 I'm getting 143/65 and if I weren't persnickity and checking it, it's plenty fast enough that I wouldn't even know it.