They slip into VR the same way a Magician slips into Astral Projection. They don't need anything to see/interact with AR, not even glasses/contacts with image link software. They just see it.
On a side note, there has been talk that if Technomancers go into areas with no wireless access, they get all twitchy. Nothing rules-wise, they just like "hearing" the background noise of the Matrix at all times.