Why does my game constantly upload 9 KB/s of data?

When I run my game from Xcode on my iPhone, the Network panel shows 8-9 Kb/s at all time.

On the panel it shows that 99% of it is UPLOAD.
The only download it makes is about 10 Kb for the ad banner and that’s all.
My game uses Prime31 plugins for Social Networking, StoreKit and iAd.

Note that this uploading happens even if I disable wifi, and when I re-enable wifi, the iPhone starts emitting constantly through wifi.

Note that this constant uploading also happens when I run the game independently from Xcode. I know this because I have a RF meter that detects wifi signal.

Why is that happening?

Are you using Unity Free? If so, it sends back some data to Unity. Maybe that’s it? If you have Pro you can disable the telemetry in the build options.