Since switching to the unlocked iPhone I am not able to get text transmission for voice mail. I have not found a solution & assume AT&T does not provide this service for unlocked phones. Would love to be proven wrong!
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I had this same problem with an unlocked iPhone 8 plus. I am not sure why this seemed to fix it but I clicked on report problem and then hit cancel since I didn’t want to send the voice mail out, but after that it worked. Mine will not transcribe until after I listen to the message first. Hope this helps.