Methods, systems, and devices are disclosed for wireless communication over unlicensed spectrum using a femto cell. In an implementation of the system, a dualmode mobile device adapted to communicate over a licensed frequency spectrum and over an unlicensed frequency spectrum is provided. The dual-mode mobile device detects the presence of a femto cell communicating over an unlicensed spectrum and in response, initiates a communication connection with the unlicensed spectrum femto cell. Subsequently, the connection over a license spectrum may be disconnected upon successful establishment of the connection over the unlicensed spectrum. In yet another implementation, a femto cell communicating over an unlicensed spectrum may be adapted to communicate with a mobile switching center and/or with a voice over IP switch.