Some T-Mobile users find their voicemail transcribed on Google's Phone app2
It does appear that this feature is just beginning to rollout to T-Mobile subscribers. A few customers of the nation's third largest carrier who have received the message from Google explaining the new feature, say that it is not yet up and running on their phone. Those who have the feature and have seen the transcription service work in real time, say that it takes a few seconds after the voicemail is left for the system to transcribe it.
We will speak to our contacts at T-Mobile and see if we can find out some more information about what is going on there in regard to voicemail transcription. If there is something new to pass along to you, we will update this story.