Then, check the activity lights on your wireless router (often called a wireless modem if you’re connected to cable or DSL broadband Internet). One low-tech way is to shut off all your computers, smartphones, and tablets so that none of your devices are turned on.
Turn Off All Devices to Check if Someone’s Accessing Your Wi-Fi There are several ways to detect whether or not someone is using your wireless network, such as obtaining direct router access via a browser or using router checker apps. How to Check Who is Using Your Wi-Fi Network
