Firewall requires Android 4.0 and higher.

Monitors application network activity. Features:

Filter the external traffic of the applications and utilities installed on the device. Choose between Wi-Fi and cellular network filtering, and take advantage of customisable rules (filter by IP addresses and/or ports, by entire networks or IP ranges).
Monitor current and transmitted traffic; receive information about the addresses/ports to which applications connect and the amount of inbound and outbound traffic.
Review detailed logs of device network activity. The information can be sorted by a wide range of parameters.