Android
Turn Off Auto-connect for a Saved Wi-Fi Network auf Android
Android keeps every Wi-Fi network you have ever joined in a list of saved networks. By default, each of these has Auto-connect turned on, so your phone reconnects the moment the signal is in range, even in the background.
This is convenient for your home or work router, but it causes problems with networks that are unreliable, have limited data, or belong to a place you visit occasionally without wanting a permanent link. Turning off Auto-connect keeps the password stored for manual use, while stopping the automatic handshake.
Where to turn Auto-connect off
Go to Tap on Settings ➔ Tap on Network & internet ➔ Tap on Internet ➔ Tap on Saved networks ➔ Select a Saved network ➔ Enable or disable Auto-connect.
Once disabled, the network stays on your saved list but Android will only join it again if you tap it manually from the Wi-Fi picker. If you never want to see or use that network again, forgetting it is the better option instead of just toggling this switch.