AT&T is warning customers that their personal information might 
have been breached as part of a scheme to unlock and resell devices.
The company said in a filing
 to the California Attorney General's office that employees at an 
unnamed service provider it works with had accessed the personal data of
 customers including social security numbers and date of birth.
    
  According to a letter the company has sent to customers, the breach
 occurred earlier this year between April 9 and 21 as three workers 
pulled the customer data in order to request unlock codes from AT&T 
which could then be used to remove the device from AT&T's network 
and allow the device to be resold.
The information was apparently 
part of a scheme by the group to unlock and resell devices on the 
AT&T network. The company typically allows users to unlock their 
devices from its network by entering a code which can be obtained from 
the company by supplying account information including portions of the 
customer's social security number.
California law
 requires companies to issue a public disclosure any time they suffer a 
breach affecting more than 500 residents, though the company has not 
said exactly how many people were affected in this incident.
AT&T
 said that it has snail-mailed letters to the customers whose data was 
accessed, and is offering to pick up the tab for one year of 
credit-monitoring services, least the social security numbers be used to
 register unauthorized charge accounts.
The company is advising 
affected users to register for the credit reporting services and change 
the passcode associated with their accounts.
AT&T's disclosure
 comes just days after restaurant chain PF Chang's said that it had 
fallen victim to a breach of employee card data. The company, fearing a 
breach of its payment system similar to the Target hack, has decided to 
temporarily revert to the use of carbon paper imprinting for all customer card payments.
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