I use the below freeze alarm and it works great. It saved me twice this year. The biggest issue is if you your phone is via cable it will become disabled when the cable goes out. Land lines work best since they tend to become disabled less frequently than cable phone lines.
Control Products Intermediate FreezeAlarm Custom Temperature and Power Outage Alarm FA-I-CCA with voice message to up to 3 phone numbers / Quick Status Check
by Control Products
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