Handover is the process of switching among the available services without any interruption. Vertical handover is a technique of switching from one type of a network to another type of network (e.g., from WiFi to WiMAX). Seamless handover between different access technologies is a great challenge as it needs to obey different performance of QoS and security constraints. Service users are becoming more demanding regarding roaming capabilities across different networking technologies such as WiFi, WiMAX, and CDMA as they claim service continuity with QoS requirement and good security features. Vertical Handover Decision (VHD) algorithms need to be designed to provide the required Quality of Service (QoS) to a wide range of applications while allowing seamless roaming among a number of access network technologies. This paper is about the implementation of the VHD algorithms designed to satisfy these requirements. A combination of 3 parameters i.e. Data Rate, SINR and RSS are evaluated to take decision of the best network among available.