How to Factory Unlocked iPhone 4S 16GB White Verizon USA?

My Self Niraj Bhalodiya from Junagadh, Gujarat, India.
I'm student.
I'm planing to buy iPhone 4S.
I found one person who want to sell his iPhone 4s.
He had purchase iPhone 4S 16GB White Verizon from USA about 2 months ago.
He sell this phone because he want to buy iphone 5c.
He use iPhone on GPP sim.
the condition of iphone is very good.

I'm going to buy iPhone for first time.
So I don't have detail knowledge about iPhone.

He buy iphone 4s on 1yr contract buy its project work done in 2 months.
So, he paid remaining payment to the Verizon.
He said me the Verizon network carrier are not provide unlocking.

So,
My Question is
1. How many money I spend on this phone.
2. Can I Unlocked phone working with all GSM Network carrier?
3. If yes, What is charge to unlocking?

4. What is Jailbreak?
5. What is bad ESN?
6. What is iCloud Lock?

Reply as soon as possible.

You can easily get this done on www.imeitool.com

It's fairly cheap and it's really quick service. Also raises the value of your phone.

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