There’s nothing quite as irksome as reaching for your cell phone to make a call and having it lose its charge right when you hit send. But thanks to modern green technology, we may never have to suffer such a fate again. From stylish and svelte phone cases with solar chargers built right in to wearable solar panels that collect the sun’s rays and convert it into valuable talk time, check out our top 5 picks for green gadgets that let you charge your phone on the go.