It's an up to date phone certainly. But it sure as fuck isn't new. Hence why I believe it used to be Vinny's, and when he left the Frat, he also left a little viral present on it before handing it over to Rusty. Rusty claims it's been reset to default, but we know this to be a lie (Or at least Rusty believed it was and didn't check it himself), because all of Vinny's old contact list is still on it.
Was it Vinny's old cell phone? We do not know that. But it doesn't matter because this new (old) phone can't have the Jade/MC video on it and the new phone doesn't have the Swyper app installed. I strongly suspect that this new Swyper app contains a virus and opens back doors.
I think it was so Rusty found out so the MC's old cell phone wasn't safe. How? The DIK cell phones are connected to the DIK laptop and what do some DIKs do? You use the Swyper app. This is how the virus got onto DIK Laptop.
Rusty said it wasn't until EP6 that he created new passwords for the laptop. But that's not all. The DIK laptop is in the safe and only Rusty, Tommy and the MC have the safe combination.
What else happened in EP6? Derek was shitting and sleeping in Tommy's room. Tommy and Rusty interrogated Derek. Why? Because Rusty found out how the DIK laptop got infected and she asked Derek about it. Derek will also have told Rusty and Tommy that he installed this app at MC. This will let them know so that no DIK has betrayed the DIKs. The MC receives a clean cell phone where the Swyper app is not installed, was not installed or has been cleaned.
But the DIKs now know one thing so that someone can use the Swyper app for their own purposes. Who? Who did Derek live with before the DIKs? Bert the nerd. So I think it's also for the nerds to spy on the Alphas, DIKs and probably the Preps too. Why?
The DIK Mansion used to be the college cafeteria and by becoming the DIK Mansion, the nerds have lost their place where they can play DNG. To do this, they had to move to the Frozen library. The President of the Nerds has a cute girlfriend who loves to party. Where? At the HOTs, the DIKs and at dorm parties. Sally may be sweet, but is she loyal? The nerds definitely have the talent to create an app like Swyper and Derek said in EP4 so it's a new app.