Xiaomi's mobile phone downloads voice broadcast, why doesn't he broadcast it by SMS?

I meter 1 setting method: first, turn on the incoming call and SMS broadcasting function in the voice assistant, and then ensure that it can be broadcast normally. For example, after clearing the memory, you have to enter the authorization management of the security center and turn on the self-start permission and voice settings of the voice assistant. That's enough. Meters 4 should be about the same. You can try.