I am going to travel in the USA with my Samsung Galaxy SM-G900F phone, whose 4G network frequencies are 800 / 850 / 900 / 1800 / 1900 / 2100 / 2600.
I want to use AT&T, which I read
uses 700MHz as it’s primary LTE frequency. AT&T also uses 1700, 1900 and 2300 MHz frequencies as its supplemental coverage in some markets, to provide additional LTE bandwidth.
How good is the AT&T coverage for the 1700 and 1900 frequencies (which are the only frequencies that both AT&T and my phone has)?
Unfortunately, this frequency band was previously used for 2G service, and has only recently been repurposed as an LTE band, so coverage is currently minimal.
You should get 4G in New York City on AT&T on this band, but don’t count on it anywhere else.