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The Samsung Galaxy S9 is identified by its model number: SM-G960XU. It is the ninth generation of Samsung's Galaxy Series that was released in March 2018. Available in Lilac Purple, Midnight Black, and Coral Blue.

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Why is my Wifi slow when using Cellular data?

Greetings! I was wondering why my phones wifi signal is painfully slow when cellular data is on, but when I turn it off, it is fine. What could be causing this?

Thanks in advance!

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Hi @random_user_101 ,

Is your mobile phone data also being used (check plan data amount available to see if it reduces) when using WiFi?

Try starting the phone in safe mode and check if the problem is still there when you have mobile data still enabled.

If it is OK then perhaps a downloaded app is the cause of the problem. It may be prioritizing using mobile data instead of WiFi and if it is downloading at the same time this puts pressure on the phone’s resources. Something has got to give.

Finding out which downloaded app is the cause may be the tricky part

One example of this may be the Play Store app. Check the Play Store app’s auto updates setting to see if it is set to mobile and WiFi or just Wifi only

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Random _User_101 will be eternally grateful.
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