An Android app developer has published what he says is conclusive proof
that millions of smartphones are secretly monitoring the key presses,
geographic locations, and received messages of its users.

In a YouTube video posted on Monday, Trevor Eckhart showed how software
from a Silicon Valley company known as Carrier IQ recorded in real time
the keys he pressed into a stock EVO handset, which he had reset to
factory settings just prior to the demonstration. Using a packet sniffer
while his device was in airplane mode, he demonstrated how each numeric
tap and every received text message is logged by the software.

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Maybe you will watch the video which you'll find within the article:-

http://www.theregister.co.uk/2011/11...ne_spying_app/

I found it fascinating (and a little surprising!).