Factory unlocked S20+ 5G running Android version 13 and UI version 5.1 on T-Mobile network in USA. A few basic dialer codes are working, such as *#06# *#0*# *#0011# and others. However, a number of seemingly basic codes are NOT working, including, *#1234# *#1111# *#2222# and many others. Why are they not working?
