Cant change preferedtype

[Android Central Question]

I can dail *#*#4636#*#*..phone Info.. Set prefered types.. GSM to lte not change.. Yy when I click lte it again in GSM only..

 

[Ry]

I can dail *#*#4636#*#*..phone Info.. Set prefered types.. GSM to lte not change.. Yy when I click lte it again in GSM only..

What phone?

What carrier?

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