Laravel - Notifications - Customizing The From Number

If you would like to send some notifications from a phone number that is different from the phone number specified in your config/services.php file, you may call the from method on a NexmoMessage instance:

     * Get the Vonage / SMS representation of the notification.
     * @param  mixed  $notifiable
     * @return NexmoMessage
    public function toNexmo($notifiable)
        return (new NexmoMessage)
                    ->content('Your SMS message content')