Why does the Android device connect to a secured wireless router without providing a password? During the weekend, I was able to connect to a secured wireless network via an Android device (Asus Transformer Tablet), but when I tried to connect to the wireless network via my laptop it was requiring the connection key (which I didn't know).

Can anyone explain me how was this possible?

I've tried to see the password of the wireless network on the Android device, but (I guess for security reasons) the current password for a wireless network is not shown in its settings.

(The secured network was not previously saved/configured on the Android device.)
Do you have another Android device (like a phone, maybe) that you'd previously connected to that same Wi-Fi point?

Android 4, Ice Cream Sandwich, (and possibly older versions too, though I don't have any to hand to check) has an option to sync saved Wi-Fi passwords between different Android devices on the same Google account. Here's the option under Settings -> Backup &amp; Reset on my phone:



There are also apps that allow you to sync Wi-Fi passwords between your laptop and your Android devices, though I assume you'd know if you had one of those installed.