Yahoo hands the phone to JajahMountain View-based Internet phone company Jajah will soon provide the technology, billing and customer care for phone features in Yahoo's instant-messaging service Yahoo Messenger, the AP reports. The deal is part of Yahoo management's cost-cutting plans to turn much of its feature development over to third parties. Yahoo Messenger has 97 million users, but Yahoo won't say how many actually use its Internet phone service — probably because the number isn't nearly as impressive.