This review may contain spoilers. I can handle the truth.
It's a beautiful film. Many may despise non-credible spiritual interventions but I see no sense in criticizing this. To me, it's credible in the universe of the film and if "souls" (one's or of other beings) can move a table, why couldn't they send an SMS?
I love the director's work on this film. I found the long scene where she travels around and the story is driven only by the SMSs is great!
A week after having watched Personal Shopper, I appreciate it more.