Zipcar App
On my iPhone 4 I could barely get the app to work. I'm really surprised I didn't just give up on it. Once I got it working though, it did what I expected. One last piece of disappointment though is that I couldn't use the iPhone app to open the car the first time and that I needed my ZipCard. That honestly, made me really angry, and made my first ZipCar experience less than enjoyable, but luckily it ended up working out later and I was in a good mood.