The iPad Pro is the best computer to lose at a rest stop at 1AM

It’s also fortunate that my iPad had a mostly-full ten hour battery and an active data plan: Any Wi-Fi-only devices, including iPads and Macs, will only broadcast a signal when they’re connected to a known network. A lost computer won’t automatically reach out to an open network, even if there’s one available; it has to be one you know or that’s been manually connected.

Just another great reason to have an iPad with LTE & data plan.