Collects and sells data
The app tracks your location
Unable to be monitored
What Truecaller says, "Manage all your calls and messages quickly, by filtering out telemarketers, robocalls and other unwanted disturbances. With a community-based spam list updated by millions of users worldwide, Truecaller is the only app you need to make your communication safe and efficient."
What SGS says, "Spam calls are annoying for everyone. Truecaller is a good step in preventing them. Although not 100% effective remain cautious of giving this app access to personal information."