Is there an alternative to this app? If this app can change the setting, there must be something built into Android that can change it. Maybe in the shell with setprop?
So I might have found an alternative, however, I can't test at the moment due to lack of 5G in my area. I found a build.prop option that should force the phone to use NSA+SA mode.
Code:
# For special ro override property 0: not support 1:nsa 2:sa 3: 1+2
ro.vendor.radio.5g=3
Also, can someone with Verizon tell me if they can get 5G SA if they set their network to "NR only"?
In my area, it seems that Verizon has their network using the 77, 260 and 261 bands, but nothing for 5 and 66, and I get limited 5G on band 2. It also seems the status bar icon lies about 5G whenever I'm using bands 2,5 and 66, even if it's only LTE.
Edit: Seems in other areas I'm getting 5G NSA over band 66. I found my phone was choosing LTE bands that had slightly better signal strength despite having much slower speeds. When I force my phone to use bands 2,5 and 66, speeds are much better, whether 5G NSA or only LTE.