Quickoffice, a company that makes mobile office document software for smart phones, has raised $3 million to help it expands at a time when users are expected to start using their phones for more tasks.

With the full-screen iPhone about to launch with better browsing speed (enjoying a so-called 3G network), the Plano, Texas QuickOffice has been loading up on ammunition to exploit what could be a very large market. It already bought Dynoplex, a company that makes a Microsoft Office Suite for Blackberries, and announced a move to embrace other devices.

Investors include Barry Cottle, Alan Masaret, Access Technology Capital, Shea ventures, Mayfield, Shea Ventures, Shepard Ventures, and Patrick McVeigh.