Enable 4g ​​only mode Android 6?

Question

Android

When working from a laptop, so that the phone does not switch automatically. Huawei honor phone. 3g only has an automatic selection. I called the support service They said that it was possible in Android 5, but in Android 6 there is no longer such an option. In support of the operator, they also said not to turn it on. Can anyone help how to enable it without root, the codes from Google do not work.

Answer 1

*#*#4636#*#*
and then look for the desired item. put wcdma only there.
It worked on all phones, what I tried

Answer 2

5k