What can you do with an old phone

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Turn your old phone into an security alarm
When the door opens you get a call to your phone
You can make a security device with an old phone
and microrupteur
you have to set the phone on speed call first
solder 2 wire on the key you set
solder microrupteur
you can get the microrupteur from microwave or in electric store
The copper wire is taken from an old transformer. it is coated with insulating material and does not take a lot of space