The addition of a firewall represents an important step forward for the level of protection available for smartphones and multimedia computers, F-Secure said.
The added firewall feature is important, according to the company, as most new smartphones have access to wireless public networks at airports and other public places.
Kimmo Alkio, president and chief executive at F-Secure, said: "The actions of smartphone operating system vendors such as Symbian have increased the general security level in smartphones against mobile viruses.
"These actions are a good start but do not provide an answer to threats such as public network intrusions.
"Our product development for mobile security continues apace and introducing a firewall to the product is a logical step that finds its analogy in F-Secure's PC products.
"People should realise that smartphones too can be attacked through a Wi-Fi connection and not only by mobile viruses."