Tricks Fool Caller ID It wasn't long after caller ID became popular that some people signed up for telephone services to block their number from being displayed. Now comes another trick: Companies are marketing systems to help callers fool telephone identification services into thinking they are someone else entirely. &lt;FONT face="verdana,MS Sans Serif,arial,helvetica" size="-2"\ color="#666666"&gt;&lt;B&gt;-The Washington Post&lt;/B&gt;&lt;/FONT&gt;