(For GPRS, CDMA1x, 1xRTT, EV-DO, EV-DV and other technologies, the symmetry of uplink and downlink data services is an obvious advantage of WiFi. For the 2Mbit data rate of 3G indoors, WiFi also has certain advantages. It now uses the 802.11b specification, and the theoretical data rate can reach 11Mbit.)