There are many reasons why the Wi-Fi connection on your Android device could be running slow. Most are completely innocent, but it could be that someone is using it without your permission. In this article, we'll show you how to find out exactly who you're sharing your Wi-Fi network with, and how to kick any intruders off it forever.
Once you've downloaded the app, open it, and you will see the name of your network on the home screen, along with the Refresh and Settings buttons. To see all the devices connected to your Wi-Fi network, tap Refresh. You will then see a list of devices, along with an indicator that tells you if it's a smartphone or PC.
Tap any device on your network to bring up a list of options for interacting with that device. These include sending pings or Wake on LAN signals, and you can even log when those devices connect and disconnect from the network.
How to block trespassing devices
If one of the devices connected to your network is unfamiliar or suspicious, your can banish it forever. Fing shows you the MAC address of each device connected to your network (the number will follow this format and be made up of numbers and letters: 'xx:xx:xx:xx:xx:xx'). Make a note of this number.
On the computer that is connected to your router, enter your router IP into the browser, then enter your router login details on the next page
Once logged into your router, find the Security options (its location varies between routers and may be located under Advanced Settings)
In Security, click MAC Filtering, then Add Device
Enter the MAC address of the device you want to ban in the MAC field, give it a name if there is such an option, then click Apply, Save or OK
While you're logged into your router, it might also be worth changing your Wi-Fi password, seeing as your last one may have been compromised.
That's all there is to it. Let us know in the comments if this works for you.