Listen up, Zipcar users!
You don't need a smartphone in order to find or lock up your Zipcar. According to Zipcar.com, you can locate or lock up your car remotely via text messaging:
Find your Zipcar in a crowd, without a fancy smartphone. Just text the word "honk" to 74657 and beep your way back. Forgot to lock the Zipcar doors? Text "lock" to 74657 to secure the car without walking all the way back. (It's also a neat party trick.) For safety reasons you can only lock, not unlock, via text. But you can honk, lock or unlock during your reservation from the mobile site on any phone.