I've never heard of a company leaving a line open with no phone on it.
I've also never heard of a company giving phones to people, then letting them sell it later as usually you get the phone for a discounted price. (unless you paid full price for it).
Ummm...maybe my math is off...but:
300 dollar phone
-150 dollar discount
-50 you paid
100 dollars left over....so who paid that money??
And you did this twice?
Hmmmm....all sounds kinda fishy to me.
I would just call Sprint, give them the
ESN numbers off the phones, and ask them if you can activate it on your line. As for selling one of them, I'd probably do the same thing....ask Sprint.