I haven't had trouble with the app. (Haven't really been using it as a key because I haven't driven the car except in the driveway, I'm a secondary driver though.) Yesterday, when my mom and I got back from shopping, the car locked with all three of my keys (including my phone) inside though. They were in my fanny pack and I had taken it off and put it in my backpack because it was a long drive. Mom used the fob she keeps on the table to open it though. If we're out and it won't open for me despite having the phone in my fanny pack, I take the card key out and tap it on the driver's side.