The wireless carrierand immediately took steps to lock out the intruder.
A subsequent investigation found that the unidentified person had accessed the names and Social Security numbers of 400 T-Mobile customers. The customers were notified in writing of the incident, the company said.
Online intruders alsoof more than 30,000 students, faculty and staff at George Mason University. The attackers broke into a server that held details used on campus identity cards.
A school representative said in an internal e-mail that the server "contained the names, photos, Social Security numbers and (campus ID) numbers of all members of the Mason community who have identification cards."
In other news, Microsoftfor its Windows operating system as part of its monthly update release. That announcement reflects a more active month than December, when the software giant issued no critical patches.
The system for releasing patches may soon get an overhaul asto vet the company's patches before monthly fixes are released to the public. The Security Update Validation Program will let select corporate customers and consultants test Microsoft's software patches. However, the company has made the program invitation-only and does not expect to involve a large number of testers.