Aug 18 (Reuters) - T-Mobile US Inc:

* T-MOBILE SHARES ADDITIONAL INFORMATION REGARDING ONGOING CYBERATTACK INVESTIGATION

* LATE LAST WEEK WE WERE INFORMED OF CLAIMS MADE IN AN ONLINE FORUM THAT A BAD ACTOR HAD COMPROMISED T-MOBILE SYSTEMS

* ABLE TO VERIFY THAT A SUBSET OF T-MOBILE DATA HAD BEEN ACCESSED BY UNAUTHORIZED INDIVIDUALS

* ALSO BEGAN COORDINATION WITH LAW ENFORCEMENT AS OUR FORENSIC INVESTIGATION CONTINUED

* LOCATED AND IMMEDIATELY CLOSED ACCESS POINT THAT CO BELIEVE WAS USED TO ILLEGALLY GAIN ENTRY TO CO'S SERVERS

* INVESTIGATION IS STILL UNDERWAY

* ABLE TO CONFIRM THAT DATA STOLEN FROM OUR SYSTEMS DID INCLUDE SOME PERSONAL INFORMATION

* T-MOBILE US -HAVE NO INDICATION THAT DATA CONTAINED IN STOLEN FILES INCLUDED CUSTOMER FINANCIAL INFO, CREDIT CARD, DEBIT OR OTHER PAYMENT INFORMATION

* APPROXIMATELY 7.8 MILLION CURRENT T-MOBILE POSTPAID CUSTOMER ACCOUNTS' INFORMATION APPEARS TO BE CONTAINED IN STOLEN FILES

* NO PHONE NUMBERS, ACCOUNT NUMBERS, PINS, PASSWORDS, OR FINANCIAL INFORMATION WERE COMPROMISED IN ANY OF THESE FILES

* T-MOBILE US-JUST OVER 40 MILLION RECORDS OF FORMER OR PROSPECTIVE CUSTOMERS WHO HAD PREVIOUSLY APPLIED FOR CREDIT WITH T-MOBILE CONTAINED IN STOLEN FILES

* TAKING IMMEDIATE STEPS TO HELP PROTECT ALL OF INDIVIDUALS WHO MAY BE AT RISK FROM THIS CYBERATTACK

* RECOMMENDING ALL T-MOBILE POSTPAID CUSTOMERS PROACTIVELY CHANGE THEIR PIN

* APPROXIMATELY 850,000 ACTIVE T-MOBILE PREPAID CUSTOMER NAMES, PHONE NUMBERS AND ACCOUNT PINS WERE ALSO EXPOSED

* ALSO CONFIRMED THAT THERE WAS SOME ADDITIONAL INFORMATION FROM INACTIVE PREPAID ACCOUNTS ACCESSED THROUGH PREPAID BILLING FILES

* NO CUSTOMER FINANCIAL INFORMATION, CREDIT CARD INFORMATION, DEBIT OR OTHER PAYMENT INFORMATION OR SSN WAS IN THE INACTIVE FILE Source text for Eikon: Further company coverage: