Truecaller never uploads your phonebook to make it searchable or public. 3G or WIFI is required for Truecaller Caller ID to work. Operator charges may apply. The block text feature is currently not supported for devices with Android 4.4 (KitKat).
What's new in this version:
Version 6.11 introduces tags: Help us describe callers better for you by adding relevant tags. Just tap "Add Tag" and select the tag that describes the caller best.