To @irotsoma@lemmy.world's point, could a phone app be made to :

• Record tower eNBID, signal strength, and GPS coordinates on a regular basis
• If, near a given GPS coordinate, eNBID is now different, or the same with significantly changed strength, alert the user

Theoretically this would allow a device to notify on a new "tower"/etc. Oddly enough I'm going to be around a bunch of telecom people in the coming weeks, so I might ask about this.