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The first-generation iPhone was released on June 29 , 2007 , for $ 499 ( 4 " GB ) and $ 599 ( 8 " GB ) with an AT&T contract .
 AT&T
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 AT&T