Mobile data very unreliable with wifi on

[jperrywinters]

Hello all,

Had my S21 5G on T-Mobile US for several months now.  I noticed this thing is VERY slow to connect to mobile data when I'm out and about if I have wifi on if it connects at all.  I can literally turn off wifi and boom, internet access full speed 5G.  I've had to resort to adding a Bixby routine to turn off wifi whenever I leave the house, then turn it back on when I'm home.  This works, but I shouldn't have to create a workaround to make this very basic functionality behave as expected.  Has anyone else experienced this issue?

Thanks in advance.

[xSteveuk]

Hi
Try going settings
General management
Reset
Reset Network Settings

[ohwell]

I can't get a signal in on my S21 ultra while sitting next to my wife who has an iPhone 12 Pro max and she can, we are both on the 3 network 🤔

[AndrewL]

@jperrywinters: Can you try heading to Settings > Connections > Wi-Fi > Tap the 3 dots in the top right > Advanced > Switch To Mobile Data, and toggle this option on to see if you notice an improvement?