Portable [upd]: Realitykings Upcoming

Because the Portal is a streaming device, its performance is entirely dependent on your internet connection. It requires a sustained high-speed Wi-Fi connection (Sony recommends at least 5Mbps, with 15Mbps recommended for optimal play). Without a strong signal, input lag and visual artifacts could hamper the experience. Furthermore, the Portal cannot play games on the go via cellular data, limiting its use strictly to Wi-Fi networks.