So you want to bring your phone on your run. You might think an armband is the best option. Often, it’s not: You may be better off with a running belt. However, if you’re really set on carrying your phone on your arm, we’ve determined after 50-some hours of testing (and hundreds of miles of running with iPhones lashed to our biceps) that the Tune Belt Sport Armband is the most comfortable, stable, and easy-to-use armband for most runners.