Unlicensed Mobile Access (UMA) is a technology that provides access to GSM and GPRS mobile services over unlicensed spectrum technologies like Bluetooth and 802.11 WiFI wireless LAN.

A mobile subscriber with a UMA-enabled, dual-mode handset moves within range of an unlicensed wireless network to which the handset is allowed to connect.
Upon connecting, the handset contacts the UMA Network Controller (UNC) over the broadband IP access network to be authenticated and authorized to access GSM voice and GPRS data services via the unlicensed wireless network.

Nokia 6136 is currently one such S60 mobile phone that supports UMA technology