[Q] Dial secret codes on samsung galaxy tab s 8.4 lte topic

Hi everyone,
I wanted my tab to be be locked upon 4g, so did some googling on it and found this code *#*#4636#*#*. To be run on the dial pad. I did but it did not work. Please by the help of screenshots or a small video can anyone help to how to run this on the tab.by the way i have a sim inserted one tab s

Regards,
The tab s 8.4