When the mobile phone wifi and traffic data are turned on at the same time, as long as the wifi network is in good condition, the mobile phone automatically chooses to use the wifi channel, and only when the wifi signal is poor or the network is disconnected, the mobile phone data traffic will be enabled. But sometimes open at the same time, but there will still be a part of the data traffic consumption reasons may have the following:
1.wifi is unstable, occasionally intermittently disconnected, at this time enable data traffic;
2. It may occasionally leave the wifi range, and the data traffic is consumed due to background software updates or data push. Note: If there is a wifi network, it is recommended to turn off the data traffic and turn it on when you need to use it.