Activated Wi-Fi function on the mobile phone is a major security risk. Hackers can use public Wi-FI spots to gain access to other people's cell phones.

Passwords, addresses, e-mails and other sensitive data could be spied on via the WLAN. It's better to turn off the wireless connection when you're on the go. The energy of the battery is consumed much faster if the phone is constantly searching for networks. With deactivated WLAN on the smartphone, you can also save electricity.