Other answers here so far were kind enough of pointing to you the red flags (or rather red arrows), why it's a scam and how it works.
Depending on the jurisdiction you are, I assume you are in the US (since you talk about college debt), but:
Notice: you risk criminal prosecution here.
And yes, I know you are the victim here, you sound like an honest person who felt prey to such a scheme.
The scam you felt into is a money mule kind of scheme:
Are you getting some tailored legal advise from a lawyer? That is, you will need more information than what you get from random strangers in forums (like this).
Could you afford to pay for the iPhones with your own money? The faster you react, the better, but don't do anything without asking a lawyer.