Truecaller MOD APK versions, including those claiming to offer version 13.4.5 with premium features unlocked, are unauthorized, third-party modified applications that pose significant security risks. These tampered apps often contain malware or spyware designed to compromise user data and may result in the permanent banning of the user's phone number. To avoid these risks, users are advised to utilize the official app or authorized subscription services for premium features. For details on why modified versions are unsafe, see this discussion on the Truecaller Community Forum . Why Modded APKs Are a Risk You Don't Want to Take