Sprint is warning several thousand customers that a former employee sold or otherwise provided their account data without permission. In letters sent via snail mail to some customers, Sprint urged recipients to contact customers service and change their existing personal identification number and security question. Turns out, a Sprint employee accessed “multiple customer accounts,” between Dec. 2008 and Jan. 2009. “It appears this employee may have provided customer information to a third party in violation of Sprint policy and state law. We have terminated this employee. The information that may have been compromised includes your name, address, wireless phone number, Sprint account number, the answer to your security question, and the name of the authorized point of contact on your account.” Sprint spokesman Matt Sullivan declined to say how many customers were sent the letters, but said it was less than one percent of its customer base. A woman who