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If secure information that only a small number of trusted individuals should know suddenly gets out, there might be some chance that the leak came about as a result of a phone tap, particularly if you have discussed the information over the phone at some point.  This is of particular significance if you are in a position that makes you a valuable person to spy on. For instance, if you have a high-level position in a powerful company with many competitors, you might be in danger of falling victim to the underground information industry.  On the other hand, your reasons for being tapped could also be as simple as going through a messy divorce. Your soon-to-be-ex-spouse might wiretap you if he or she wants to dig up information that could be useful during the divorce proceedings. If you want to test this out, you can do so by confiding a fake piece of information that seems important to someone you know you can trust not to tell. If that piece of information gets out, you know that someone else was listening in. If your home was recently robbed or broken into but nothing of value was taken, that alone should suggest to you that something is odd. Sometimes this can suggest that someone broke into your home for the sake of putting a wiretap on your phone.
Be concerned when your secrets get out. Stay alert if you have suffered a recent burglary.