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Twilio, a startup that can add cool phone features to web applications, has raised around $3.7 million in new funding, according to a regulatory filing.

The San Francisco startup says it can accept calls from landlines, cell phones, and VoIP phones. Once developers add Twilio features to their apps, the company gives them a phone number they can provide to customers. Then Twilio answers the call and handles the interaction with the application. We’ve covered a couple of Twilio-powered products in the last few months, including Order Mapper’s iPhone app for ordering pizza from anywhere in the country and Buzzeromantic’s service for connecting your doorbell to voicemail and the web.

Twilio raised a seed round of undisclosed size in March from Founders Fund and Mitch Kapor. The filing lists Albert Wenger from Union Square Ventures as a board member, so presumably Union Square participated in the new funding. I’ve emailed the company for confirmation and more details, and will update if I hear back.

Competitors include Ribbit, which is owned by BT.

Update: Chief executive and co-founder Jeff Lawson just confirmed the new funding. He says the round was led by Union Square, while Founders Fund and Kapor converted their debt financing from the seed round into equity. Both Wenger and Founders Fund’s Dave McClure joined Twilio’s board with the new round.

There are now 6,000 developers and 1,000 live applications using Twilio, Lawson said. He described the company’s goal as “democratizing” these features, by making it easier from both a business and technology standpoint to add phone calls and voice.

“Instead of thousands of engineers, we wanted millions of developers building their applications with Twilio,” he said.

Lawson added that we can expect new features soon, as well as expanded sales and marketing.

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