Bear in mind that Sprint is one of the options. Fi uses both T-Mobile and Sprint and intelligently selects between the two based on network reception and perfo

Bear in mind that Sprint is one of the options. Fi uses both T-Mobile and Sprint and intelligently selects between the two based on network reception and performance (the latter being the coolest feature -- my 4G speeds are consistently fast). Sprint was probably cheaper than Verizon and AT&T, making them a more economical choice. The second reason I have no solid data on and have been meaning to investigate further since the anecdotal experiences I have had with Fi support it (but have no idea how to get good data on this[0]). I think T-Mobile's and Sprint's networks are complimentary and Sprint has reach in places where nobody else provides good coverage. The concrete example of this is my parents' home in the thumb area of Michigan. Every other provider has a dead zone near Fort Gratiot going for about 2 miles on M-25...except Sprint. Every provider has service in the city the home is located in, but only AT&T and Sprint cover it well (4G in most parts of the city except for low lying areas where only Sprint and AT&T seem to get any service). My travels through the thumb with T-Mobile resulted in several areas where coverage dries up but the same travel with my Fi phone yields good service in most places[1]. [0] The provider maps are notoriously terrible, indicating theoretical service where it isn't from a real-world standpoint. There are crowd-sourced apps like OpenSignal that measure actual coverage, as well, but they had no good data for this area because it requires one to run the app, which is already a fringe "geek" thing, and the app has to be polling at the time you enter the area. I'd spent almost every day of an entire summer up there with my phone and there was no data on signal quality for T-Mobile. This is beyond the fact that some areas reported data that was plain wrong (likely outdated or resulted from a phone model having a different/significantly better radio than mine). [1] I checked the same month I switched since I had been used to having no data for about half of the drive, causing Pandora to quit. To my surprise it worked for all but a couple of miles and in those spots, I still had 3G. We also have friends up there who run AT&T (which gets 4G almost everywhere except our property) and my family is on Verizon (which has reasonably good service when it's confused about being a Canadian -- a problem Fi has as well).