1. Introduction
The origin of telecommunication services in Pakistan can be traced back to 1947 that was followed by a major change in 1962 when telegraph and telephone services were separated by the establishment of independent T & T and postal department. Later on developments were made in the provision of telecommunication services to the customer on consistent basis but from the last two decades revolutionary changes in the telecom sector have taken place with the introduction of mobile telephony. This shift brought Pakistan telecommunication sector into a new era of growth and progress that had a great impact on its subscribers who became more sensitive about the service quality, pricing and switching barriers.