CallApp is a no.1 Caller-ID, Dialer, and Contacts app. Ranked among the 45 most downloaded apps on Google Play, it identifies a billion of unknown callers before you even pickup a call. It sources its information from Facebook, Twitter and all other major social networks and web sources.
CallApp has a call blocker feature to effectively block spam calls, a Caller ID that can identify a billion unknown callers (people & businesses) ,and also offering pictures and information on them. It also keeps you informed of the social status updates of your contacts. Best of all, this app is free, unlimited, with no ads.