Nokia is already a major customer of Nuance, which provides both speech and predictive text capabilities on a number of Nokia's handsets. The deal announced Wednesday could bring more Nuance technology to Nokia phones but will also produce open protocols that developers can use to build such features into applications for the handsets.

Nuance is a major supplier of speech-recognition software for both PCs and mobile devices, and last year bought the maker of the widely used T9 software for completing words that cell-phone users are trying to type in e-mail or text messages. It has gone beyond basic voice-enabled functions such as dialing and now offers additional capabilities such as text or e-mail dictation and searching for content on a phone or products in an online mobile store. Nokia is the world's largest mobile-phone maker.

Under the new relationship, Nuance will provide Nokia with some of those more advanced features, said Michael Thompson, vice president and general manager of Nuance Mobile Speech. But the implications for third-party applications could be even more significant.

Full details haven't been worked out, but the idea will be to let developers using Nokia's Series 60 and Series 40 software platforms take advantage of Nuance's speech-recognition and other functions in their applications, Thompson said. Rather than having to approach Nuance separately, the developers would get access to those capabilities through the Nokia development platforms. The companies said they would provide developers with open programming interfaces, language models and development tools.

The applications they build could appear on a wide range of phones from low-end devices to smartphones, and Nuance's technology spans functions that take place both on devices and on servers, Thompson said. Server-based speech recognition, accessed over a high-speed mobile network, can leverage much greater processing power and consume less memory and battery life than what is done on the phone itself.