Depends on why you want communications. Many setups are good enough to discuss lunch plans or cracking wise about the last stretch of down.
For even elementary safety, though, I'll consider radios expensive adult toys and side with Andy Carey about staying in visual contact. Yep even in the NE woods where I ski also. If it's a group inbounds, then sure, there are usually established lines everyone follows until things open up enough to just track each other visually. Shouting every so often is not a bad idea idea either, for giving your companions a general fix, as is stopping periodically as a group to discuss the next lines. But IME, real backcountry skiing in the trees is a lot more like cross country with a pack than what the movies show with their hours of site exploration to show the pros blasting through perfect pillows and richocheting off trees, then opening up onto endless perfect powder. Woods are slow, with maybe a small glade or 100 yard straight shot to reward an hour of getting there. If you have any bases left. Very cool but a different sport when you don't have an advance crew scouting out where you'll be skiing, or take several patient exploratory runs yourself first.
Similar story in backcountry faces and bowls; if you haven't skied it recently, your life may depend on skiing thoughtfully and stopping to inspect. As a group. No need for phones, since everyone should be looking at everyone else. Hopefully while a few of you test the snow.
Bad weather presents a countercase; if it's suddenly a whiteout, radios can be helpful.
But look at it this way, whiteout or not: If someone is out of sight, they may be in trouble or dead even before you realize they're missing. Then, how long does someone have in a tree well, vs. how long does it take you to get your phone out, try a few times to reach them, then put the phone back, curse the bad reception or assume your companion is too lazy to respond, but start searching anyway? Can you do all that in 60 secs, find them in another 60, and dig them out in another 90? Or how exactly does having a phone help you find your buddy in an avalanche? A beacon, yes. A phone, unclear. Best prevention: Watch each other. Literally. That said, it's a good idea to carry a phone/radio, but not for what the OP suggests. Instead to call for help if you're lost, stranded in bad weather or the accident's already happened. And in that case, a satellite phone works better than any other, although there are some solid marine radios. Neither are cheap.