iMessage makes it easy and cheap to send text messages between iOS 5 devices
With around two trillion text messages sent in America alone every year, SMS text messaging is the most widely used data application in the world and the number two use of mobile phones - the first being to check the time. It's also a cash cow for telecommunications companies with the average charge worldwide of around US$0.10 per message for data that essentially costs the telco nothing to transmit because it is sent on the control channel - a small part of radio bandwidth that is used to send information between the tower and phone about call setups. Apple's iOS 5 update - if you can get it installed - sees the addition of a new iMessage app that could have telcos nervous as it allows text messages to be sent for next to nothing.
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