Spencer Soper, Bloomberg:

A strange phenomenon has emerged near Amazon.com Inc. delivery stations and Whole Foods stores in the Chicago suburbs: smartphones dangling from trees. Contract delivery drivers are putting them there to get a jump on rivals seeking orders, according to people familiar with the matter.

This is a real sign of the times. And, I suspect, a hack that will quickly spread beyond Chicago. Desperate for work, drivers have figured out that Amazon’s dispatch software hands off deliveries to the driver closest to the Whole Foods store with the goods to deliver.

Follow the headline link to see an example of one such tree. From what I’ve read, Amazon appears to be aware of the behavior. I’m assuming drivers hang their phones and then park nearby, with an eye on their phone.