Hi, If you need to send an sms then you can sign up for a 'email to sms' service. Then you can send the email from TeslaScada to the service, but the client will receive an sms. I did try this at one point and it worked fine but it got a bit expensive. The difference between emails and sms is that email remain within the internet, so are effectively free, but sms have to involve a telco and they always charge.