Wireless communication technologies change daily with tremendous speed. The first generation consists of analog circuit switching, the second is digital circuit switching (GSM) with 10 Kbps, the third generation is digital packet switching (Wideband CDMA) and now 4G is for very fast speed. A communication unit is said to be flourishing if calls are recognized correctly and efficiently. Handoff is very important for effective use of networks. Switching between GSM and WLAN is implemented with consideration of coupling architecture. Continues data signals are transmitted and received by switching wireless technology from WLAN to GSM and vice versa. Simulation results validate the seamless switching.
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