From what numbers can I send SMS?

From the dashboard

You can send bulk SMS from the SMS page in the dashboard using any UK caller ID on your account.

If you send these from a UK landline number, you won't be able to receive responses; you can only receive a response from any UK mobile number purchased from (or ported into) Yay.com.

From the Yay.com App

You can send SMS from the Yay.com app from any UK mobile number you've purchased from Yay.com 

Please see this guide for how send SMS from the Admin Dashboard

Please see this guide for how send SMS from the Desktop app

Please see this guide for how send SMS from the Mobile app