I was just there with my JetPack about a week ago - this was my first visit so it's a sample size of one, so bear that in mind. Hopefully it's still useful information. In the valley there were places that I got solid 4G coverage, but if I moved 10 or 15 feet I'd drop to 3G (usable) and then to 1X (not usable).
Housekeeping camp -- solid 4G inside the cabin, nothing outside by the fire ring (even though I couldn't carry the device that far, the signal travelled the same distance without issue). Coverage felt totally random, but was repeatable.
Curry village -- inside the main restaurant building it was unusable. Outside, there were spots that were very solid.
Camp four -- I don't remember if I had 3G or 4G, but it felt usable.
My other coverage feedback I can offer. T-Mobile had basically zero anywhere. AT&T had solid coverage at the top of Glacier Point. Sprint was weak, but usable, in a few places.
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