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If your main interest in telephone-based home automation is protecting your home from water leaks, freezing, and power failure, consider a self-contained home monitoring solution such as the Sensaphone 1100 series of monitoring devices. They are self-contained, so if your home loses AC power, you can still receive warnings via telephone. The Sensaphone Cottage Sitter series is based on the 1100 series and also provides remote control of temperature and X10 modules.
A self-contained home monitoring system is a better solution, especially for protecting a second home, vacation home, or vacation cabin. The Sensaphone 1100 series of monitoring devices is a popular monitoring solution.