Voice Over WiFi is a technology that offers voice calls through the WIFI network instead of a mobile network access network. The Access network is a special part of the mobile network. This particular part connects the user's device to the network. Users can receive calls, internet use and other services. It has an extension of Voice Over LTE (Voice - Long -Term Evolution) and the ability to be seamlessly connected to the existing telecom infrastructure. This special voice over -WiFi technology can provide clear voice quality, low -call drops and advanced connections in poor signal areas. Voice over WiFi technology is an important basis for ensuring good quality voice service. If this technology is launched then the network will be overwhelmed. As a result if there is WiFi, the phone will talk on the phone. As a result voice over WiFi will play an effective role in solving various problems. If we introduce voice over WiFi (VoWiFi) technology for customers then we can make voice calls through the IP network using WiFi instead of the traditional network. At present four telecommunications operators are serving more than 18 crore customers in Bangladesh. Broadband internet service is providing about 3,000 ISP operators. Currently broadband Internet service donors will be launched using voice over WiFi services. As a result the benefit of direct voice calls will be introduced to the mobile number using WiFi instead of the SIM card. With the introduction of this facility the customer can provide fast voice over WiFi services considering the weak network of the vulnerable network. The fast voice over WiFi service is a very good technical system to solve this weak network problem of customers. If this technical service is launched then there is no network in the SIM. But we can call the other mobile number with WiFi connection in the respective handset. It will cost customer bandwidth to talk to this technology. It will not be spent directly on customers. The use of this technology will reduce the rate of call drop. Users often have problems due to poor signals between high buildings and homes. Voice over WiFi technology can solve this problem using a home or office wifi network. Network congestion is also a common problem in big cities. Voice over WiFi technology can reduce the pressure on the network by removing voice traffic to the Wifi network. This will make it possible to save a valuable radio frequency (RF). As a result mobile operators will be able to provide high quality voice services to their customers at a low price. Meanwhile despite the widespread expansion of the mobile network, there is a lack of mobile network coverage in many rural and remote areas. Affordable Broadband Service -powered WIFI Network may provide alternative channels for voice calls. As a result even if there is no mobile network coverage  customers will be able to make their mobile voice calls using the broadband powered WiFi network provided by ISP. Calls through voice over WiFi are affordable for mobile operators and users. One of the major benefits of voice over WiFi technology is to improve the quality of voice calls. Bypassing the mobile access network it confirms high quality voice calls. Calling through WIFI is the voice quality clear and high quality. In addition the use of stable WIFI network reduces the rate of call drops. It is possible to call without a call drop between WIFI and mobile networks through the advanced vowifi system being a SIMless handover. Meanwhile the customer will only cost WiFi data to speak in this technology like WhatsApp, Messenger. No separate charges will be deducted for the call. Despite the many benefits of Voice Over WiFi technology there are some challenges in its acceptance. One of these challenges is the lack of WIFI network. Although broadband access in urban areas is widespread, the WIFI network in rural areas is not yet stable. Therefore in order to address this challenge, the importance of expansion of rural broadband services must be given special importance. One of the important things, on the other hand, is the elimination of the device consistency. Many old smartphones do not support voice over WiFi technology. Therefore Affordable Voice Over WiFi Technology Supported Devices Providing Providing Devices should be increased as well as raising awareness. The successful implementation of this voice over WiFi technology requires the improvement of telecom operators as well as coordination between internet services and policy makers with them. Many users are still ignorant about the benefits of Voice Over WiFi. So users need to raise awareness. On the other hand to enjoy the benefits of Voice Over WiFi technology, operators and Internet service providers will have to campaign to raise awareness among users.