Android
Turn On Wi-Fi Automatically auf Android
Android can bring Wi-Fi back on by itself once it recognizes a network you have joined before, but only if two conditions are met at the same time.
First, the network has to be saved on your phone. Second, the signal strength has to be good enough for a stable connection. If reception is weak, Android deliberately skips the automatic switch and keeps you on mobile data instead, since a shaky Wi-Fi connection often performs worse than cellular.
This behavior is controlled by a dedicated setting inside your network preferences, separate from the manual Wi-Fi toggle in the quick settings shade. Turning it on means Wi-Fi quietly reactivates whenever you walk back into range of a known network, without any action from you.
To enable or disable it, go to Tap on Settings ➤ Tap on Network & internet ➤ Tap on Internet ➤ Tap on Network preferences ➤ Enable or disable Turn on Wi-Fi automatically.
If you regularly work in areas with unreliable Wi-Fi coverage, leaving this off gives you more control over when your phone switches away from mobile data. Battery impact from the feature itself is minimal, since Android only scans for saved networks in the background at a low frequency.