This concept is not my original. I borrowed it from a telecom weekly from Ericson.
Ericson uses a high end telecom network UMTS to make this possible.
The door can be locked or unlocked by sending an SMS.
The Number of users registered can be defined. Its as good as us duplicating the house key.
A motor can lock or unlock a door once it recieves and verifies the SMS. The concept can be used ofr other home appliances also
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