Enhanced Security Measures for flights to USA, Canada and UK (Wed 16 Jul 2014)
All those travelling to USA, Canada and the UK are required to switch on their electronic devices at the Dubai International airport or risk being denied access to fly. Please ensure that your electronic devices have sufficient power before reaching the airport. This is part of enhanced security measures required by the authorities of these countries
Although this is a practice started at Dubai, other airports are also following it.