With all the issues surrounding the fob, including dead batteries and cracking plastic, I just wish TM would put all its features into the mobile app. Here's why: My phone is PIN protected, the fob is not. If the fob drops out of your pocket near your car, your S might not be there when you get back. It's not less secure to use your phone to access/drive your S, it's more secure. TM can add new features to the mobile app with ease (like driver profiles), but updating thousands of fobs seems challenging. It's one less thing to carry around, and I always have my phone and it's always charged. Heck it will have a 60 kWh battery! Bluetooth can be used to handle the proximity awareness issue. Maybe fire up the Bluetooth polling five minutes before you plan to approach the car so the Bluetooth battery drain isn't occurring all the time. I'll already be using the app to precondition the car anyway. I can give car access to other family members without having to give them a fob. How many people with teenage kids have had them lose things? They are more likely to lose a fob than their phone. It costs something like $350 to replace a fob (so I've been told). I'll bring a fob along for valet parking, taking the car in for service, etc. I already use my phone to do my banking, buy online and in stores, check-in for flights, and many other things. I want to add "Access and Drive my Model S" to that list.