Call Insider is a free application which helps to identify unknown phone numbers and block unsolicited calls. We have designed the app to do exactly what you need. And nothing more. That makes using it very easy. Identification of callers More then 300 million of identified telephone numbers. We use data from more than 100 websites to recognize phone numbers. Number rating By rating numbers, you help both the other users and yourself. Moreover, you harm telemarketing companies. Yay! Privacy protection Protecting your privacy is our No. 1 priority. We only use your contacts to distinguish the known numbers from the unknown. We never save them and don't give them to anyone.