Stock LG G4 with Android 6.0 works as it should, that is a typical SCP older phone (no earfcn).
Confirmed B25 10x10 earfcns are 8140, 8290, 8390, 8640. Likely are 8090, 8140, 8240, 8290, 8390, 8440, 8490, 8540, 8590, 8640 assuming typical alignment [thanks to lilotimz for helping to finalize this list]. Messy situations would have to be identified per market.