The primary revenue for a phone company isn't advertising, it's selling bandwidth. For a server to be pulling key words, the server has to be transferring all those key words. If they do it at your cost, you'll soon notice that your monthly data limit gets burned up in a few days without you using it. If they do it at theirs, they'll eat into their profit margin far more than data mining is likely to pay for. There is no scenario they get this done efficiently without making it immediately obvious.
Mass wiretapping violations by illegally monitoring your cellular customers isn't even in the same ballpark as insider trading. These aren't minor crimes, they're felonies that come with a five year sentence and a $250,000 fine for every instance. Insider trading isn't even illegal on it's face, one of the problems with the view that executives get away with things is that many of the "crimes" they've supposedly committed aren't actually crimes.
As a member of a company, it is your prerogative to dump your stock at any time, based on inside information that you have of that company. What is not legal is if you share that insider information with someone else so they can dump theirs. All these fat cats that bail out of a company on the way down aren't breaking any laws by doing so. They're only breaking laws if they falsify the information going out to the public, or committing any number of other white collar crimes. People that went to prison at companies like Enron and Worldcom were indicted for actual fraud, things like cooking the books to hide falling revenues, resulting in false financial statements to the SEC.
Going to a minimum security prison isn't because they're rich either, it's because they're non-violent and the only real concern we have while keeping them locked up is that they'll get bored and off themselves one night by hanging themselves with their own bed sheet. According to Wikipedia, Bernard Ebbers is serving more time, at the same prison, than a would be presidential assassin, a hacker that stole tens of millions in wire and credit card fraud, and an eco terrorist that firebombed a university. A great many violent criminals have gotten a lot less than the 25 years he did, including child molesters, rapists, and murderers. All he did was preside over a bit of white collar book cooking.