Apple will close its recently acquired Quattro mobile ad network on September 30, in order to focus entirely on iAds; meanwhile, Research In Motion (RIM) is understood to be attemtping to purchase its own ad network.

According to The Wall Street Journal, RIM is in talks with Millennial Media about a potential acquisition, but talk has been restrained by Millennial’s asking price of between $400 million and $500 million.

“We believe iAd is the best mobile ad network in the world, and starting next month we

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