What's Happening to Maggie's Phone?

The phone does not record any orientation changes when all this happens. At 908 in 58 seconds, Alec texts Maggie that he's going to check on his mom. Obviously, Maggie will never read this text. And then at 910 p.m., 929 p.M., 942 p.m,. 957 p.m.," and 1008 p. m., Rogan calls him again and again and again - trying to reestablish contact with his friend who suddenly seems to have just disappeared. The defense kind of makes a big deal about this. Alex walking, but her phone isn't. So how can he be? How can he have the phone if his phone is moving