these are hipstermobiles
The hipster sits on a banana seat closer to the rear wheel of the hipstermobile while the iPhone sits on the handlebar in a specially-designed mount, available through Amazon.com. Whilst pedalling the hipstermobile, the hipster will issue voice commands to the iPhone. Typical commands include:
"Take a photo of this ironic building and post it to my Tumblr."
"Use Wikipedia to find a virtually unknown folk band from circa 1982 and then Tweet it to everyone who follows me."
"Is there a free BYOB arts & crafts festival in a two-mile radius of my current location?"
"Go into my draft folder and send that plea for more money to my parents."
Hipstermobiles are often spotted near cafes and post-gentrification diners, near arts & crafts festivals, and in parks during normal peoples' working hours.