At home or in the office, Wi Fi network is indispensable. It can't be supported by traffic alone. Do you need to turn off Wi Fi when you can't use it? China Telecom has also popularized this issue a few days ago, and their proposal is to close it.
If you don't have Wi Fi or you don't need Wi Fi, you can save power if you turn it off. However, the key to China Telecom science popularization is not to save power,It's about safety, because as long as the Wi Fi is on, it will send out a signal, which is detected by the Wi Fi probe.
At the 315 party last year, you may remember that CCTV exposed the device of Wi Fi probe. It looks like a router. Criminals will use various means to install this device in public to detect the Wi Fi of dense crowd.
If the WiFi of the consumer's mobile phone is on, the mobile phone will send a signal to the surrounding area to search for the wireless network. After the probe box finds this signal, it can quickly identify the MAC address of the user's mobile phone, and then convert it into the IMEI number, and then the mobile phone number.
When these information are combined with big data, a number of privacy information such as consumer's home address, ID card number, search record, consumption record and so on can be obtained.
Based on this, China Telecom suggests that if you don't connect Wi Fi in public, you'd better turn it off to avoid being used by others.
As a matter of fact, it's better not to use free Wi Fi in public places if it can't be used. This may also have security risks.