What is Unlicensed Mobile Access (UMA)?
The UMA specification was developed by wireless companies in an effort to retain control over cellular and Wi-Fi traffic. Unlicensed Mobile Access integrates Wi-Fi voice services with the mobile operators GSM networks. Subscribers with a Wi-Fi enabled cellular phone can switch from the network they use when out of the their home to Wi-Fi when they enter their home or the area covered by their Wi-Fi home network.