Quote:
Originally Posted by KaneED
You don't need to send a message or receive one for the phone to get signal things. How do you think the network knows the phone is there to send the message to?
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There are signalling and messaging channels in the GSM spec that are broadcast to all phones in a particular cell so that actual 'messages' are not sent for background tasks, generally.
That load of interference you here on your car radio could be a call coming in, but is likelier to be the phone registering with the new cell (which it determines based on signal strength and traffic congestion), but even that won't cause it to light up and appear to be active.
I saw the same thing here in the US a couple of months ago and I don't know what the **** it was.