RapidSpike support multiple ways of configuring event notifications. One of these it to send an SMS message to your mobile device when a configured rule generates a notification.
In order to configure SMS message notifications, first click your user name in the top right hand corner in order to open the Account Menu. From this click on Settings to be taken to the Account Settings screen.
From this screen you can enter your mobile/cell phone number. Be sure to use the correct flag to correlate to your location as this sets the country code for the number.
Once this is configured, in the Notification Rules you will now have SMS available as an option.
As well as this, you can also configure a Voice Call Notification.