Going on a school trip? This is a free app for Android and iPhone that turns your phone into a Walkie-Talkie using your data network. Press the screen to talk and your group will hear.
http://ictmagic.wikispaces.com/ICT+&+Web+Tools
An amazing download for PC and mobile devices allows users to communicate by 'push-to-talk' in a walkie-talkie style. A great resource for communicating on school trips, host a virtual meeting, or just getting teachers/students communicating across your school.
http://ictmagic.wikispaces.com/ICT+%26+Web+Tools