What this feature does is automatically switch between wireless and mobile data, depending upon which has the best connectivity and signal strength. In other words, you might be bouncing between mobile data and wireless networks, but your device will always (automatically) remain on the strongest network.

Do phones automatically switch to Wi-Fi?

When you have Wi-Fi turned on, your phone automatically connects to nearby Wi-Fi networks you’ve connected to before. You can also set your phone to automatically turn on Wi-Fi near saved networks. Important: You’re using an older Android version.

Why does my Android automatically turn on Wi-Fi?

○ If your Wi-Fi signal becomes weak or unreliable, your phone will switch to mobile data automatically. ○ Wi-Fi will turn on automatically when you’re within range of Wi-Fi networks you use frequently.