by Chloe Albanesius November 21, 2011

AT&T on Monday emailed select wireless customers to warn them of a recent database hack.

Spokesman Mark Siegel said no accounts were actually breached and less than 1 percent of AT&T’s customer base was affected.

“We recently detected what could have been an organized attempt to obtain information on a number of customer accounts,” AT&T said in a statement. “The people in question appear to have used ‘auto script’ technology to determine whether AT&T telephone numbers were linked to online AT&T accounts.”

“Our investigation is ongoing to determine the source or intent of the attempt to gather this information,” AT&T continued. “In the meantime, out of an abundance of caution, we are advising the account holders involved.”

That includes emails to those affected. “We do not believe that the perpetrators of this attack obtained access to your online account or any of the information contained in that account,” according to a note sent to one PCMag analyst. “Use of your mobile device or other AT&T services has not been affected by this incident.”

The email warns users that they might be at an increased risk for phishing attempts or text-based scams.

The news comes about five months after a San Francisco man who participated in a hack of AT&T’s servers to gain access to email addresses and other information about Apple iPad customers pleaded guilty in a Newark federal court.

Daniel Spitler, 26, pleaded guilty to one count of conspiracy to gain unauthorized access to computers connected to the Internet and one count of identity theft. He and Arkansas resident Andrew Auernheimer, 25, were arrested for the hack in January. That came about six months after AT&T acknowledged a breachthat exposed 114,000 e-mail addresses and ICC-IDs of various Apple iPad 3G owners, including Michael Bloomberg, Harvey Weinstein, and blogger Kara Swisher.

High-profile hackings have been big news in 2011, from the massive Sony PlayStation Network intrusion to the recent hack of an Illinois water utility and the Steam gaming forums.