When clicking on one of the AppNana offers from the first Appnana Offers section, when actually clicking the following is happening:
The AppNana app connects to aarki.net (to be prcecise:
http://hs.aarki.net/adpick/garden), and with a lot of parameters. A lot of your personal phone information is handed out!
Here is an example of a call from my Dutch HTC phone:
http://hs.aarki.net/adpick/garden?
src=49D4B67277BAA3E4AA
&xbtn=y
&platform=android
&sdk_version=3.0
&device_platform=android/4.2.2
&device_model=HTC One X
&device_manufacturer=HTC
&device_brand=htc
&device_product=htc_europe
&uixe=6c1c1b586f671f0f101a07406f686f
&pixe=691b195466671f401314014e606869
&dixe=631b1d5a6b65194414120716696d6f61
&nixe=6b4d100f6f6816411f42034d3d6c64300a
&user_agent=Mozilla/5.0 (Linux; U; Android 4.2.2; en-nl; HTC One X Build/JDQ39) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30
&app_sec_key=TfSMSG6o3wrtFGzBKhIhG33Vf60N
&advertising_id=06484d41-c02f-490f-997c-67465feae167
&tracking_limited=n
&package_name=com.appnana.android.giftcardrewards
&country_code=NL
¤t_locale=en_NL

As you can see, my AppNana number n6215050 is probably somewhere encrypted in one of the uixe, pixe, dixe and/or nixe parameters.
Aarki.net is the production advertisement domain of
aarki.com, a media advertisement company.
This all seems within the bounderies of the standard AppNana app permissions.