answer:No, it would not. Cellphones and routers operate at different frequencies for the most part, and use entirely different protocols, so it wouldn’t work just by holding them up to each other. Trying to do it the way analog modems did back in the days of dialup (the old beeps and squawks) would end in naught as, again, different protocols, and even if you did make a translator to reconcile the differences, you’d have a garbled signal that would max out at 56Kbps and probably wouldn’t get even one-tenth that due to noise. Oh, and doing it to my router wouldn’t work anyways; I use “whitelist” security, so unless you’re an 802.11n-compliant device with a MAC address that is on my whitelist of approved/authorized devices, you just. Won’t. Connect. Period. Even my phone (which is on my whitelist) would not be connecting that way as it wouldn’t be using the wifi transceiver with the correct MAC address. Of course, there is wifi tethering, but that requires turning the wifi on the phone on, and will work even at a fair distance. But if you can tether a laptop to a smartphone, you can generally just use the phone’s 4G connection for data and leave my wifi alone anyways. There are also mobile hotspots that do only that, but most smartphones are also capable of tethering…. if you don’t mind draining the battery at a ridiculous rate. As for wireless car keys, I have no idea what you are talking about… unless it’s the use of a laptop hooked to a special third-party transmitter to hack the car, or the car itself is modified with a celular receiver to allow you to pop the locks from your smartphone.