The use of Voice on internet protocol phones depends on location, cost and types of services provided by the companies. There are locations with no mobile network, and in that case VOIP are used. Another reason is cost, if the cost of acquiring internet service is relatively cheaper than other phones network services then companies will go for VOIP. And VOIP service comes with a combination of phone and internet service which makes it cheaper. Cost, location and service are what companies considers when it comes to the decision to acquiring VOIP.