Iphone activation for sprint?

I have recently bought an IPhone 5 off my friend for 100 usd thinking it was cheaper then buying it for the regular 200 usd (I made sure it was the sprint version of the phone so I know it works on there network)

So my question is that can I activate my iPhone in the sprint store without buying it form sprint or apple?

If the esn is clean and you have good credit.
if not its just a ipod touch