Reds are fine during editing, but after exporting to my phone they turn Orange

I'm recently experiencing the same issue and can tell you without a dought everyone else is wrong.  When you look at your photo in the develope module and it looks correct, and then there is a color shift in the library module, it means that ADOBE RAW is not working correctly.  I had to manually change white balance and color in the library module to fix the color shift and now all my exported JPG images are perfect.

If the phone where using a color managed OS (like an iPhone) then yes, ProPhoto RGB would preview fine like any other color profile. But when it isn't color managed, you have to dumb everything down to sRGB and still, without color management, a mismatch can occur.