Sprints Weird Billing system. Free Phone?

[thrasher086]

So I purchased the PPC-6800 last Thursday and received on Friday. The lady discussed that it will be 452.53 after tax and there will also be 100 dollar mail-in rebate. I had them charge my credit card the price. Also an 18 dollar upgrade fee will be charged my account and not the credit card.

The next day after I got the phone, I checked my credit card and say they did charge the right amount(no double amount or anything). I then went to my account on Sprint.com to see if they charged me 18 bucks and to my surprise the money they charged on my credit card was credited to me. I had a left over bill for 33 bucks and now I have a credit of 417 or something. Not even the 18 dollar activation fee is there and I know they charge you right away once the phone is activated.

It has been almost a week and it is still there. Anyone know how Sprint bills or maybe I just lucked out? Thanks