In the time of disaster, the information exchange between rescue helpers and survivors is difficult and the wired connection and cellular network are also collapsed during the disaster and it also not possible to reconstruct the network to communicate with the helpers and survivors. In this paper, we discussed various technologies to help trapped survivors to reach the rescue workers in the wireless network even in the absence of cellular network using the wireless ad-hoc network, opportunistic network and using smartphones which uses wifi interface to reach survivors and rescue workers. One is using directional antenna for ad-hoc networks using inter-vehicular communication for quick reconstruction of network, and the other is opportunistic network using ad-hoc communication presents HELPME a self levelling opnet application deployed in smartphones which uses ad-hoc network for communication over wifi in the time of disaster and it forms a dynamic matching of its neighboring nodes to transmit the information with the help of ad-hoc network. And the third one is using team phone a network application for disaster recovery. Team phone consists of two components The messaging system between rescue worker and trapped survivors integrate cellular networking, ad-hoc networking, and opportunistic networking, and enables proper communication.and the self-rescue system that groups the smartphones of trapped survivors together, energy-efficiently discovers nearby messaging nodes and sends out emergency messages including location and position information.