Leaving it vague for players is a fine thing. I don’t recommend leaving it vague for game masters; if your local utility fog can perform teleportation by simultaneously rewriting all your quantum numbers so you’re here instead of there, that will be a very different style of teleportation than one that meddles with spacetime (and shows up on very different kinds of sensors).

Have you read Walter Jon Williams’ Metropolitan and City On Fire? They’re a very interesting technomagical future, where magical energy is literally on tap as part of the infrastructure.