If you want to provide complete protection against hackers and espionage, then Firewall No Root is for you.Glasswire Data Usage Monitor provides users with easy mobile data monitoring.AFWall+ adds additional features like connecting with the tasker to perform predefined tasks.NetGuard provides simple and advanced ways to block access to the internet.KeepSolid Firewall can filter your traffic and block malicious websites, prevent phishing etc.Rethink defends your phone against spyware, ransomware, and malware that attempts to steal your personal information.Xproguard Firewall lets you block particular apps on your Android from accessing the internet without root access.Firewall Security – No Root lets you control access to the internet by managing which apps have access and which don’t.InviZible Pro is powered by Tor, DNSCrypt, and Purple I2P to provide a complete solution for online privacy, security, and anonymity.These are some of the best firewall apps for Android that can help you to monitor all incoming and outgoing traffic.