When my wifi stops it uses my mobile data y ?

[Sohailgagai]

When my wifi stops it uses my mobile data y ?

When my wifi stops giving data I dont know why but When it does my phone starts using my mobile data without any notification and I end up using my data pls guide thankyou .

[aakashnawab7]

If option is turned off, it should not switch to mobile data. Maybe it's because of some bug or cache memory.
You can reset network settings. This may help you out but if not solved then
You can do 2 things
1) Turn off data when you connect to your WiFi. (You can manually do this or can create a Bixby routine that will automatically turn off data when you connect to a specific WiFi network)
2) there's another option which keeps mobile data on while connected to WiFi network. This option is ON by default but can be turned off. This toggle is available in Developer Options.
It will not solve problem but network switching will be visible to you as it will take some seconds to turn on data again.

[Sohailgagai]

Thankyou for the reply
What do you think is the best option for me .

[aakashnawab7]

Best is to reset network settings.
2nd is if it's easy for you to reset complete device, then go for it.

[Sohailgagai]

I cant erase everything so I will reset network

[aakashnawab7]

Listen brother. i have checked. And found something. There's a setting in WiFi settings. Which you had clicked to ALWAYS CONNECT. That's why you're facing this issue.

Just reset network settings, and you will start getting notification everytime WiFi is unstable.

[aakashnawab7]

Add your WiFi network into exemptions list.
Then your phone will not switch to data for that specific WiFi network instability.

[Sohailgagai]

Where to add exemption how to add

[aakashnawab7]

Remove internet cable from WiFi Router to disable internet access. Your mobile will prompt a notification to switch from WiFi to data.
Select keep using wifi. Your WiFi name will automatically added in exemption list.