Call Blocker is an app to block unwanted calls on Android. <b>Features:</b> • Block specific numbers • Block by prefix (e.g.: 800 blocks all 800xxxxxxx) • Blocked calls history • Dual SIM support • Backup and restore with optional encryption • No ads, no tracking • 100% open source (GPLv3) <b>Privacy:</b> • No internet connection required • No data sent to external servers • Your blocked numbers are stored only on your device <b>Compatibility:</b> • Android 9 - 17 (API 28+) • Uses native Android CallScreeningService <b>Permissions:</b> • Phone: To identify and block calls • Notifications: To alert when a call is blocked