Android 2.3–2.3.7 "Gingerbread" is a discontinued version of the Android mobile operating system developed by Google and released in December 2010. The Gingerbread release introduced support for near field communication (NFC) (used in mobile payment solutions) and session initiation protocol (SIP) (used in VoIP internet telephony).Gingerbread's user interface was refined in many ways, making it easier to master, faster to use, and more power-efficient.