The notion that there's a cell phone that would make him able to move between worlds strains his credulity to the limit. Then again, he's in a Nexus of all realities, so perhaps it's not that surprising.

"Hence why I'm not bothering with changing the past. But thank you for the advice on the PINpoint. I'll be sure to look for one."

Maybe that's all he needs to do. Get himself home with this PINpoint, and then he can get Noctis, Prompto and Gladio to safety. Hmm. A tempting thought.