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So is anyone making one that emits on all (or some useful subset of) the frequencies a modern smartphone uses, has a ~30mm range and is powered by the phone?

The Chinese could crank these out and have the to your door $3.99USD.

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They were selling these online from shady resellers at least ten years ago. A friend picked one up and told me he could jam some phone calls on the train, depending on carrier and frequencies used I suppose. I think it broke a week or two later and he tossed it.

Second link from google:

http://www.jammerfromchina.com/categories/Mobile_Phone_Jamme...

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