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By developer27
#85164 I'm not sure if this will help, but there is a video on YouTube showing how to get a smoke detector to send SMS messages. You might see something in that to help you.
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By ian
#85235 I had a 'doorbell' project which I wrote up
Many commercially available wireless doorbells operate at 433MHz & it's usually(!) quite simple to interface these.
I think my example will do what you want with a little tinkering.
Hope this helps.