Wi-Fi mobile phones are also called cell-internet phones or cellular internet phones. It can easily and automatically switch between Wi-Fi VoIP modes and conventional cellular modes. Wi-Fi LAN can act as a cellular repeater in effect. A phone with Wi-Fi facility has been designed to prevent drop outs. It occurs with a mobile set that fails to maintain dependable contact with a repeater. In dense urban areas and steel and concrete building the problem of drop out is very common. Drop out means there is a block in radio frequency signals between outdoor repeaters and mobile sets. It a mobile phone is close to the near limit of a given repeater's range and the mobile user move from outdoors to indoors, loss of contact or dropped cell may take place. Apart from these kinds of phones, you can also go with Nokia e72 deals and other Nokia Mobile Phones equipped with wi-fi. Advantage with Wi-Fi mobile phone set is that if a building is facilitated with Wi-Fi facility the call gets converted to conventional cellular networks to the Wi-Fi LAN. It happens due to VoIP technology which is able to maintain the call without any drop out. On the other hand if a Wi-Fi VoIP based conversation takes place indoors or within a Wi-Fi hotspot, it can seamlessly transfer to the conventional cellular network provided that the users move out of range of the hotspot during the share. Wi-Fi technology is being used all over the world and people are taking advantage of it and are able to access high speed internet from their mobile sets.