Edit - Before you read the whole thing, where I broke it down Barney style for you...
I found the exact agreement.
http://www.sprint.com/landings/returns/
If you cancel service within 30 days of activation, you are required to return your device and will no longer be eligible for any associated mail-in rebates.
If you do not return your device within 30 days of deactivation, you will be charged an Early Termination Fee of up to $200.
I highly don't recommend you do what he told you. You will get burned. You should print it all out, take it in and question him, then ask for his supervisor. If it really is a Sprint store like you said it was, maybe the sup can pull some strings. Make sure you use the words, misinformed, needs training, should not lie like that, was promised... and blah blah... Remember, you are very upset.
Original Post:
Instead of body work, I think your brain needs work. Sprint is smarter than that.
You have 30 days to return and cancel the line risk free. Fine print...
Signing a new 2 year contract is what makes you eligible for the $150 off the price of the phone. Now... The way he was trying to get you was, if you cancel in the first 30 days... the phone must be returned to the dealer. It must go back to where you got it from.
If the phone is not returned, you will see a $200 etf.
Why do you think Wirefly and those other internet 3rd parties have double cancellation fees. Then you get 6 months to pay the etf to Sprint and any hidden fees from where you got it from.
So if you do what you were advised to do by some idiot Rep. You are just as stupid as he is...
You will end up paying the price of the phone in store. Which is usually $199.99 - $299.99, then after $200 etf + any fees from where you got it from and will not be eligible for any rebates.
Depending on how the store operates... it could be a affiliate market or directly through Sprint. Either way, they're not going to give you a phone and take a loss like that. They are going to get paid no matter what. You don't realize the fact, that Sprint / the dealer takes a small hit on the phone to gain your service. Because the end pay off / reoccurring bill put money in their pockets. For a dealer the initial sign up pays a commission chunk... this charge back period lasts up to 6 months. If you keep the phone less than 180 days, you'll see a etf + charge back fee at most places. Businesses are there to make money, not teach you how to scam a company and lose money themselves.
If you return the phone, then the 30 day risk free trial applies and it gets zeroed out. So doing it that way, you end up paying more than what the phone is to buy outright. Either buy the phone for $449.99 or buy one on eBay for $380ish... or try Craigslist.
Trying to cheat the system will get you nowhere this time.
You say they only tell friend's and consider yourself lucky? You never thought of this before on your own? What's the difference between the first day and the 29th day? Nothing. Why would he sell you a phone? One last thing, of course the phone does not get blacklisted... Why? Because in the end, you will pay for it, you pay for about half in the store or that amount is put on the bill... Then you pay the rest in the form of a etf. If not paid in 6 months, that shows up as a nice charge off / balance on your credit report. Cool story bro!
1. Rep sells you a phone.
2. Commission is applied to Rep's numbers...
3. You cancel...
4. Rep gets charged back that commision.
5. Rep gained nothing and you got stuck with a etf.
6. You fail.
I was lucky and got mine for $149.99 through retention / Account Services. But that's another story...