SAN FRANCISCO (Standard&Poor's) Aug. 4, 2010--Standard&Poor's Ratings Services said today it assigned its 'A' rating to Dallas-based diversified telecom provider AT&T Inc.'s proposed notes due 2040 to be offered under Rule 144A with registration rights. We placed this rating on CreditWatch, with negative implications, where we placed all existing ratings on the company and its related subsidiaries on July 28, 2010. AT&T plans to issue the new notes along with cash, in connection with an offer, announced today, to exchange at least $500 million and up to an aggregate of $2.5 billion of existing debt securities at subsidiaries New Cingular Wireless Services Inc. and AT&T Corp., both maturing in 2031. The final amount of new notes