Bubble Motion, provider of a service that lets users send voice messages directly to others’ mobile phones like text messages, has raised $6 million in equity from undisclosed investors, according to regulatory filings with the Securities and Exchange Commission. Based in Mountain View, Calif., the company brought in $14 million in March 2008 from Comcast Interactive Capital, NCD Investors and Sequoia Capital — the last of which provided $10 million in 2007.

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