You can actually get to them without Tor via gateways, but my expectation is that sex service providers would install a Tor app on their phones to contact the h

You can actually get to them without Tor via gateways, but my expectation is that sex service providers would install a Tor app on their phones to contact the hidden service. At that point it's a matter of tapping the Onion Browser icon instead of Chrome/Safari and going to a different bookmark.