Hi, I now how to fix this bug.
1) Decompile "secondary-framework.jar"
2) Open miui/telephony/phonenumberutils.smali
3) Search method ".method static constructor <clinit>()V"
4) Change
"const/4 v0, 0x6 "
to
"const/4 v0, 0x5"
5) delete this 3 strings in the end of method
"const/4 v1, 0x5
const-string v2, "911"
aput-object v2, v0, v1"
6)Save the file and recompile "secondary-framework.jar"
It's work fine. But OTA update doesn't work after it. Because "secondary-framework.jar" was changed and CRC doesn't match. After updating to the full version of firmware this procedure must be done again, while developers will not change this method in their source code.
P.S. Sorry for my bad english.