Recently I found some spam apps appear on my galaxy s3 occasionally, the apps are actually links to web pages directing to iconadserve dot com and then redirected to somewhere else, it varies time to time. I have to delete those spam apps manually every time. I checked the services/processes running in background, and didn't find any suspicious apps. I was wondering if the phone got infected by some unknown apps I was unaware of? Any one can give some hints? Oh, the other similar symptom is, sometimes it also received similar notifications like the above, such as improve your phone's battery, performance, etc.