After recently getting my first road bike, I realized wearing an armband to hold my iPhone just wasn't going to cut it on long rides. I just got this Lifeproof iPhone Bike Mount ($40), and it's perfect. It's only compatible if you use the Lifeproof 5S case, but when you're riding fast through rain and splashing puddles, you'll want a waterproof and shatterproof case anyway.
This mount comes with three different pads to ensure a snug fit to any diameter bar, and it installs within a minute. There's even a lock to ensure it stays put no matter what. The rotating cradle holds your phone either vertically or horizontally, with your music, GPS, favorite bike app, and phone right in front of you for easy access. If you're not into biking, this can also be used on the handle of your jogging stroller.
— Jenny Sugar, contributing editor