iPhone downloading stuff in background!

Hey guys... my iPhone has gone crazy. I'm sitting next to my router, I enable Wifi on my iPhone, the router starts blinking endlessly means it's downloading/uploading. Disable wifi, router stops blinking. I really hate this, my iPhone enables Data every time I disable it so it can download/upload whatever it's doing in the background, I'm way over my 3G limit. ALL of my apps are closed, and it keeps downloading/uploading. I go to safe mode, maybe it's one of my tweaks, but even in safe mode it's downloading/uploading! It finds every way to connect to the internet to download stuff! I even removed everything I downloaded from Cydia, and it's still the same. I restore the phone, it' still the same. I reset network settings, it stops then after a few hours it starts downloading again! I don't know what to do! Is there like a way I can see the internet logs in it or something to know which sites it's connecting to? :p
Thanks a lot if anyone helps me :rolleyes:

Update: It's an iPhone 4S, with iOS 5.1.1 untethered :confused: