I noticed my voicemail doesn't transcribe my messages.

Visual voicemail for Android does not include transcription on AT&T devices. 

It's an iPhone feature. 

Hello @Tink40bell we know how it works and we'd be glad to provide you with the necessary information.

Please be advised, in order to transcribe voicemail to text it requires an iPhone 6s or later with iOS 10 meaning it is not yet available for your device.

Feel free to review this information and learn how to manage your voicemail online using our Device Support tool.

We appreciate your understanding!

Lyn, AT&T Community Specialist