SuperStream
Member
Registered: Mar 2000
Location: Border Independent
Posts: 69 |
When cellular phones are called, the phone receives a signal from the tower that a call is coming in. The phone then sends out a high power transmittion to establish a "connection" with the tower. If you have a radio nearby, you will often here noise in the background just before you phone rings. This even happens when talking on a landline. In fact, I can tell the other party that I have another call even before my mobile rings! I imagine that there is just enough electrical noise generated in the visor's circuitry to "wake" it up!
Superstream
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