Kineto Wireless, developer of software that leverages Wi-Fi technology for mobile phones, has raised $3 million in equity and debt funding, according to a filing with the SEC.

Based in Milpitas, Calif., Kineto allows mobile phones to work on both cellular and Wi-Fi networks. Last month, T-Mobile announced plans to preload its Android phones with Kineto’s app for Wi-Fi calling.

The company last raised $9 million in funding in March. Investors include Venrock Associates, Sutter Hill Ventures, Oak Investment Partners and Motorola Ventures.