If you use an Android device you may want to review how you store your settings and passwords.

From the Electronic Frontier Foundation:

If you have a recent Android phone or tablet, chances are you take advantage of a convenient feature to backup your application settings and wireless network passwords. This feature is enabled by default in Android 2.2 and later, and it can make switching to a new device or replacing a lost phone a quicker process. If you haven’t examined all the settings for your phone, you might not know if this setting is enabled.