Motor and circuit choice Answered

Hi folks, I'm a first time poster on here but I have been browsing the site for years.  Finally taking the plunge and starting my own project.
I have a mechanical setup to turn a motor and charge up some devices.  I want to keep it simple for starters and charge up something like a smart phone.  I'm a complete noob when its comes to electronics so I'm looking for some help.
What I am wondering is, what motor (or stepper motor) would be best suited to generating enough volts to charge a smart phone, and what would I need to do to be able to hook up the phone to charge?
I have had a look around the site and have found lots of stuff but since i'm not really sure what I'm looking at, and I dont want to go purchasing anything till I know what I need to purchase, I thought it safer to ask first.

Thanks in advance for your time and your help.

Paddy