On Fri, 17 Feb 2017 13:35:54 -0500, nospam wrote:

The difference between ATT/Sprint and T-Mobile/Verizon was stark.

that depends where.

I agree.
My comment was only in relation to the locale that Savageduck reported,
which was Lake Nac...Naci......eh ... Lake N-something.

in major urban areas, there's no significant difference among any of
the carriers, while in rural areas, one might be better than another,
and which carrier that is will vary.

Yup. I just ran an Opensignal report for Cupertino, California, and
T-Mobile arguably is slightly better than AT&T & Verizon, but they're
effectively the same.

AT&T http://i.cubeupload.com/2NuF7b.jpg
T-Mobile http://i.cubeupload.com/o8kiZ9.jpg
Verizon http://i.cubeupload.com/dcfRhq.jpg

even verizon has dead spots. all carriers do.

All three maps show holes in the coverage, even in Cupertino, which is
essentially near the heart of Silicon Valley.