Funny how you used the word duped. You didn't do your homework and quickly purchased. You can still get out of it and return the phone as you have 14 days, but again you have to do your homework.
Just curious? How is it that you feel that you got duped? Did it say iPhone 4S anywhere? Did at some point did you think, wow, I am getting an iPhone 4S for $99! This is too good to be true! At any point in time, did Sprint actually mislead you in any way what-so-ever? This is the typical attitude that everyone is to blame but yourself! Obviously, most of the time, it is the exact opposite. You have only yourself to blame and you appear to want to blame Sprint, and you are looking for encouragement in doing so. It is NOT going to happen.