However, the industry has gone in the direction of using GAN/UMA, which substitutes an 802.11 or Bluetooth air interface for GSM/UMTS's and as such can use unmodified commodity infrastructure.
However, the industry has changed its approach to using GAN/UMA, which replaces an 802.11 or Bluetooth wireless link with that of GSM/UMTS and thus can use standard equipment as is.