True Caller is very Good app to identify unknown numbers and block unwanted calls.true caller block the unwanted telly marketing call and promotional call that u not want to pickup call waste Ur time also u can update the user Name in true caller directory. this application will work properly as long as the user has an EDGE, 3G, or WLAN internet connection installed in their cell phone.also The search function lets users search for public numbers, which can be saved to the phone book instantly. Call filter also has a database of phone numbers which have previously been tagged as spam