Yahoo! has signed a deal with Latin America's top mobile phone company America Movil to provide mobile Web services to 16 countries in Latin America and the Caribbean.

Under the terms of the agreement, Yahoo!'s oneSearch service will be the default on America Movil's wireless carriers' portals. Yahoo said it plans to offer local versions of oneSearch for each region.

"Fostering deep relationships with mobile innovators like Yahoo! is an essential part of our mobile strategy," said Luis Cosio, value-added services director of America Movil, in a statement.

Yahoo! claims this is the largest of the 21 search deals it has announced this year with carriers. America Movil has 143 million wireless subscribers.

Yahoo! launched oneSearch service in the United States at the beginning of this year; oneSearch allows users to search the Web on the first screen they call up, unlike browsers designed for computer users, which force phone users to navigate through several screens.