Can I switch/select cell bands (LTE/3G/Etc) on the S4 /ATT/i337?

I can access the band selection page, but everytime i try to select an LTE band, my phone refuses to accept it and defaults back to the previous selection.

Any ideas before i try to root my phone?
 
Thank you. I have an AT&T phone as well and I used the code you gave and the code worked. I still have to figure out how to get the data plan to be accepted though.
 
How do I save the information once I have selected the network type? I have selected and enabled then turn off and restart the phone but it keeps returning to what it was before.
 
on your dial pad
*#*#4636#*#*
Device information
scroll down to: Set preferred network type
LTE/GSM auto (PRL) this is where you set your option
I did as seen above but its still not changing my network mode.d 4g still persist.am using Samsun s5 Verizon.pls help
 
I did as seen above but its still not changing my network mode.d 4g still persist.am using Samsun s5 Verizon.pls help

I have a Galaxy S6 SM-G920A (AT&T mobile from USA). I bought it three month ago in Cuba, where I live. So I can´t connect to 3G local service because my phone doesn´t have 900 MHz frecuency for 3G (that is the local frecuency of my network provider for 3G). I wondering if I can flash my phone to other band (Europe band or Jappanesse band) which have 900 Mhz for 3G and as a result to get the holly network type of my provider. Would someone like answer me please???? Sorry for my English, it is not my mother language. My email is eric.rey@ucm.pri.sld.cu or ericrey1996@gmail.com Please someone answer me. I need it. Greetings from Cuba.
 
looking for the option to control bands (LTE-4G/3G / 3G Only/ etc.) On my Samsung S4 SCH-I545
 
looking for the option to control bands (LTE-4G/3G / 3G Only/ etc.) On my Samsung S4 SCH-I545 verizon. pls someone help
 

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