Disable switching back to 4g automatically

[Dukexxx]

Whenever I set my network mode to 3g/2g or to 3g only, it keeps changing back to 4g whenever I switch my data sim to the other one and back. How do I stop this?

I need it to always be in 3g as I have some 3g data bonus which doesn't work on 4g

[TechiePradhumn]

Yes same problem with me but i think there is no option for this in settings.

Try code *#*#4636#*#*
Or use NetMonester app.

[rohans69]

This code won't work in samsung dialer, you need to install Google dialer to make this code work.

[TechiePradhumn]

Ok

[Kunal2]

Unfortunatly we can't force it to 3g only when we chagne data sim.it will auto switch to 4g (or 5g if mobile phone is 5g)