While charging is easy when you are at home or work, doing so while on the go can prove to be more of a challenge due to the unavailability of a wall outlet. Fortunately, there are other ways to charge your phone. If you're carrying a laptop, the easiest answer is to connect your phone to one of the computer's USB ports. Another method of charging your phone without a wall outlet is battery sharing. As an increasingly common feature on modern phones, battery sharing allows you to charge another smartphone by simply connecting the two — either with a USB cable or wirelessly.