It's unclear how big a role the mobile division will play under CEO Carol Bartz as it has been difficult to monetize so far.
Yahoo launched a new suite of mobile applications for the iPhone 3G and other handsets Wednesday at the CTIA Wireless trade show in Las Vegas.
Consumers around the globe are demanding compelling mobile Internet services that offer increased personalization, said David Ko, senior VP of Yahoo Mobile, in a statement.
To further capitalize on the market potential and continue our mobile leadership, we created Yahoo Mobile, a dynamic starting point enabling consumers to discover the world around them, stay connected through a variety of communication services, and customize content to define their Internet experience on mobile devices.
The Yahoo Messenger app can be downloaded from Apple's App Store, and it enables iPhone and iPod Touch users to send and receive messages, share photos, add contacts, and change status.
The Yahoo Mobile app is available for more than 300 handsets with HTML-enabled browsers, and it offers a portal to online content like social networks, news, RSS, and Yahoo-based e-mail.