Not securing its Web site costs a business in both dollars and customer trust. Just ask a Canadian mobile phone and pager company. Two teenagers from Wales broke into its Web server, stole customers' credit card numbers, and posted them online. "No one is ever 100 percent secure, but if they keep [their security software] up-to-date all the time their chances are really low that they will be broken into," says Chris Davis (pictured), founder of Hexedit Network Security, the company that caught the offenders. Hexedit worked with the wireless company to secure its network. But, admits a spokesperson from the phone company (which asked not to be named), "new holes are being found every day."