I just read a little on it. It looks like they have an app as well if you have a box that supports a camera. I'd hope that more and more of these services work on cell phones now in addition to phone or TV box.
It'd be nice to know if they use H265 encoding or not. That allows high quality video like H.264, but at nearly half the bandwidth. You'd still need both sides to support this to really benefit for VP-VP calls, but could make translators look more clear than if you have an older system from several years ago. H265 is a few years old, but not sure how it's been adopted due to it being newer, licensing fees, hw/software requirements.