Which of the following is NOT a key function of a Small Office Home Office (SOHO) wireless router?

A Small Office Home Office (SOHO) wireless router performs a variety of essential functions to support network connectivity and communication. Among these, providing wireless connectivity within a local area, connecting multiple devices to the internet, and facilitating file sharing between networked devices are standard capabilities expected from these routers.

The function related to "Providing access to 3G networks" is not typically associated with a SOHO wireless router. These routers are primarily designed to manage local area network connections and facilitate internet access through broadband connections, such as DSL or cable. While some devices might offer features related to mobile broadband options or have USB ports for mobile broadband modems, it is not a fundamental purpose of SOHO routers. Their primary function centers around enabling local network communications and sharing resources among connected devices, rather than connecting directly to 3G networks. This distinction highlights why the first choice stands out as not fitting the core functionalities of a typical SOHO wireless router.