I few suggestions, thoughts on this.
The Nexus is a Sprint device so you don't need to clone.
You won't get instructions on most forums for cloning
Take a minute and read through the forum rules and terms of service you agreed to when registering.

Now my thoughts!
You most likely bought a cloned phone, pageplus and a missing ESN tag spells clone or stolen.... Would you buy a car with no VIN? Better yet would you change the VIN on your car?

Now to save a whole lot of head ache and a rash of flaming

THREAD CLOSED!!!