For the last 3 years, I used Sprint PCS in Minneapolis and assorted places in Wisconsin. When I started using them in 1999 in Minneapolis their antenna density was still a bit low, but they've improved and I rarely got dropped calls.
I've recently moved to Denver. When I first came here, I got dropped calls all the time. When I called to complain, they told me to check that my phone's "Preferred Roam List" or "PRL" was up to date. Apparently the phone has some internal method of keeping track of certain things about towers. I had to take the phone to a Sprint Store to have it updated, but since I did that, I no longer get dropped calls in the Denver-Boulder area.
Of the big players out here, I think Verizon is the most recent arrival, so I hear they have the worst reputation for dropped calls. If they're investing as much money in antenna development as they are in advertising, that'll probably change before long.
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