Not doable. A neutrino detector, including radiation shielding, cannot be the size of a flip phone.

Would this help?

http://www.sciencemag.org/news/2017/08/milk-jug-sized-detect...

No, that wouldn't help.

Please look at the picture: you can see a neutrino detector being held. But what's also very important to detect neutrinos is shielding from every other type of radiation, so that you can differentiate between neutrino radiation and everything else. The shielding is done by metallic (likely, lead) bars around the detector. The shielding is much more massive than the detector.

Another point: in the article they say that they have detected a 136 neutrino events over 461 days. So you can transfer one bit ~10 days. Neutrino detector sensitivity scales linearly with volume. Now imagine if you scale down your ~5-10 liter detector to a volume of 0.2 liters (a fliphone volume).

Which is to say, not doable.

I’m thinking we’d need new physics discoveries. Maybe elements from the island of stability might help. Or something with superconductors. You never know.

Given that these things are neutral and effortlessly fly out of collapsing supernova cores, heavier elements and superconductors are not very likely to help.

By our current understanding, superconductors only exist under extreme cold, a condition never occurring naturally in stars and supernovas. So the fact that neutrinos fly out effortlessly does not preclude the possibility of a superconducting trap of neutrinos.

There is nothing about a superconductor that would trap a neutrino.

If new physics are allowed then it's simple. We just need a Neutrino detector that fits in a phone and doesn't need too much electricity.

That would require a phone made out of something other than matter.

What if the phones connect to the neutrino detector central server? The only latency would be getting to the server...