There are no phone charges, and using Wi-Fi to surf the web does not consume mobile data. Mobile data traffic refers to the data traffic generated by using mobile communication technologies such as GPRS, EDGE, TD-SCDMA and HSDPA to access the Internet or use related data value-added services. Wi-Fi is a technology that connects terminals such as personal computers and handheld devices (such as pads and mobile phones) to each other wirelessly, in fact, it is a high-frequency radio signal.