What problems are you having?Eh I just got the S3 in late October so I couldn't get this anyway. Not that I would, I'm having enough problems with this phone.
What exactly do you mean by "due for an upgrade"?
In America, cell phone providers subsidize the cost of a new phone a significant amount, if the user agrees to a new cell contract with them. So, for example, a new 2 year agreement with cell phone carrier AT&T will turn a $600 phone into a $200 phone.