This plugin does not trigger any window to enter a phone number or a message (for this -> plugin-send-a-mail-using-mandrill-deprecated_t109399
, don't mind the deprecation, it's only for the mail part. This one will open your default text message app with a given text and phone number)
When using the "Send SMS" action you have to
provide the phone number and the message to be sent.
Hope I answered you correclty