Error code 40: Phone operation failed, please try again

Devices
1

Can any experts please explain meaning of this error?

BSNL Mobile
Error code 40: Phone operation failed, please try again

image

2

Which Phone? Exact model and no?

3

OnePlus 9 Pro.

4

You may check this link → My BSNL SIM Showing Error 40, DF a8h & 50, What to do

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