sentences:  In practice, the system appears to be oriented towards carriers instead of individuals, and carriers can more easily create microcells using their own spectrum, running ordinary GSM and not requiring the use of special handsets.With the advent of the Internet and widespread availability of high speed Internet connections, GIP could be redesigned to make use of Internet instead of ISDN connections.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.