PC Magazine notes a new Android malware which will spam pop-up ads extensively to mobile phones.  Users should be careful of all links and app installs for mobile devices.

Free Android App Exposes All the Ad Networks On Your Device
http://securitywatch.pcmag.com/mobile-security/294907-free-android-app-exposes-all-the-ad-networks-on-your-device

QUOTE:  Have you noticed more and more popup ads and spam texts on your mobile device lately?  As consumers adopt smartphones and tablets in droves, mobile advertisers are adopting increasingly aggressive methods of ad delivery. Unfortunately for the consumer, rules of acceptable mobile ad practices have yet to be defined.  In January we saw one particularly aggressive ad network used to monetized several free Android apps. Symantec initially identified this as malware called “Android.Counterclank,” but hours later, Lookout Mobile Security said the SDK in question was really an aggressive ad network called “Apperhand that placed a search icon on your mobile desktop without your permission, and pushed ads through the notice bar.