After enabling, you're ready to send normal SMS messages from Alexa using your voice.
You can still tell Alexa to "send a message" but if you do that, it will try and send it via the Alexa app first. You can send them to any SMS-supporting devices, including iPhones. Previously, she could only sed messages to contacts who have the Alexa app installed on their smartphone.
If your hands are busy and you want to inform your friend that you're running late, then you can say "Alexa, text Jon", and then dictate your message.
The new voice sounds more human compared to the robotic tone owners of Amazon devices like the Echo are used to hearing when requesting Alexa's services. Users can talk to devices like Amazon's Echo and hear updates on news and weather or control smart devices with voice commands.
These are real text messages sent through your Android phone to other phones (doesn't matter what type) and not messages sent through the Alexa app. There's no word as to when the ability to send an SMS via Alexa will come to iOS users. Amazon is likely hoping the exposure will help it maintain strong Echo sales and fend off competition from Google and Apple. Even though the Echo Dot is a tiny little speaker, you will be able to perform a wide range of work by tapping a wide range of skills.
If you have an Android phone and want to start texting, you will have to turn the feature on.