Let me say this about that...
Big hue and cry, all over the net with Apple's iPhone and iPads all serving as personal GPS, big-brother-is-watching, tracking devices.
True story: I was in El Paso, not long ago, and my phone beeped. I was riding in Grace's truck, and my phone, AT&T, told me that, in Mexico, international data roaming rates applied.
I never left Texas. Never.
Interstate 10 bounces within a few hundred meters of the border, and the closest "cell" tower was obviously in