Report Anti-Theft SMS Control Issue in Emsisoft Mobile Security Posted May 24, 2017 I, too, am on Google Project fi (Nexus 5X phone). My wife's iPhone is my trusted number, and she's getting several "number changed" text each day. I drive a delivery route, so I'm moving around quite a lot each day (abt 250 miles). Project fi phones, when moving about, not only switch from one cell tower to another, they can change from one carrier network to another. I wonder if a network change is what's triggering the msgs? You might pass this on to the developers to see what they say.