My brother's new job is underground with no cell reception or 3G. He wants to leave his phone upstairs so it can receive calls and SMS, and somehow forward them to him downstairs to Android / PC / Mac (any of these would be fine) that are connected to the office Wi-Fi.
The upstairs phone may or may not be connected to the same Wi-Fi network; it may just have 3G.
Is there any combination of apps that can do this? And if the request is confusing please let me know.