In this video, you'll learn how to "MacGyver" a 40 Watt Electrical Generator from a cordless drill and a few household items. Here's how to charge a phone, illuminate small lights, and make electricity in a pinch.
Note: This project is intended to be a "bare-bones" approach to generating electricity in a tight situation. There are no voltage regulators, no diodes and no capacitors to smooth the current. There may a risk of overheating and damaging equipment when operating electrical devices without a proper circuit recommended by the manufacturer.
It worked fine for me, but if you try this on your phone make sure you understand, and are comfortable with, the risks. Back up your data in case your phone is adversely affected and your data or equipment is damaged as a result.