Lumia Bands Field Test ##382#
In the dialer, type ##3282# then click accept.
Hit the three dots (...) at the bottom and click settings.
Change automatic to manual and then you will something that says all bands active. Click on it and you can check out uncheck the bands you want.
Hit the back button, make sure to turn off the ENS toggle, and reboot.
The ENS needs to be off to prevent all of your bandwidths from being automatically selected when you reboot or toggle airplane mode.
Enable field test if does not work:
https://forum.xda-developers.com/t/fix-field-test-in-lumia-windows-10.3537871/
Field Test fix,
1: Open your Interop tool
2: Use the file path HKLM\SOFTWARE\Microsoft\Phone\Settings\PartnerImmediateDialStrings
3: Open the sting
4: Add this key (space)##3282# and save
5: Restart your phone
6: Dial ##3282# Start The field test mode
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