I've never heard of "Mariahvision" before. I'll have to check her out.
The only problem I have with these clips is that they all seem to be staged. With all the gonzo and amateur sites out there, does anyone have any clips where a girl (or guy) has genuinely received a phone call during a scene and proceeded to talk to the person while having sex? I'm sure it's happened, as I've seen many a blooper in mainstream films where they're shooting a scene, an actor's cell goes off, and he answers it as the cameras roll, usually to the hilarity of the crew and the annoyance of the director.
Closest I've seen to this in porn, to be honest, was in videos like Randy West's Up n Comers series which often would have a phone going off in the background. Not quite the same thing.