Because Wi-Fi uses radio waves to transmit and receive data, it’s invisible. That probably sounds like an odd thing to say, as well as patently obvious, but the point is that you can’t tell very easily whether you have a strong Wi-Fi signal in all parts of your home.
You won't know whether slow internet problems are due to a weak Wi-Fi signal or not, and while running internet speed tests can highlight broadband problems, knowing the exact Wi-Fi signal strength can be very useful when you're deciding where to place your router, your mesh Wi-Fi satellites and even devices such as outdoor security cameras. And the good news is that you do this for free on any iPhone or Android phone.
What's a good Wi-Fi signal strength?
Before we get to the steps, it's important to know what the numbers mean, otherwise you’ll still be in the dark. Signal strength is expressed as a percentage or, more commonly an RSSI value in dBm. RSSI simply stands for received signal strength indicator, and is what the apps below will show you.
The closer the value is to 0, the stronger the signal is. Things are slightly confusing because the values are negative, so a higher number means a worse signal, a lower number a stronger one. It's not a linear scale, either. A drop of 3dBm (say from -50 to -53dBm) means the signal is half as strong. Conversely, an increase of 3dBm means the signal is twice as strong.
What the numbers mean for common Wi-Fi uses:
-50dBm: Excellent signal strength. You’ll rarely see better than this unless your device is directly next to the source of the Wi-Fi network. Anything you can do over Wi-Fi will work well.
-55 to -60dBm: High quality signal. Devices should work well, video should stream with no issues.
-70dBm: Low quality: Not really good enough for video at any quality, but ok for emails and web browsing
-80dBm: Minimum signal strength needed for basic connection. Essentially unusable.
For your tests, you can download free apps on Playstore like Wifi Analyzer
Huawei has it excellent solution named CloudCampus APP
Thanks
