As a fan of the genre...
I cam away immensely disappointed.
There was pretty much no build up (from the phone call you knew instantly there was something going on), a lot of the dialogue made no sense and they'd clearly decided to go jargon-heavy for no real reason, not to mention the acting of some of the cast...
Now don't get me wrong, I'm a big fan of the "found-footage" genre, but there are FAR better examples out there that do actually try something a little different at least.
Having seen countless films for the genre, I'd probably say this is the worst of the lot.
Do not recommend!