Transport for LondonNever run to catch a bus again
Additionally, new Countdown signs will provide bus waiting time predictions at 2,500 key stops across the city.
The announcement comes following the signing of three contracts to develop and deliver the improvements.
Mayor of London Boris Johnson said: 'This terrific technology means anyone with a mobile or internet connection will be able to get up-to-the-minute information about London's buses as they work their way around the capital.
'Londoners will be able to find out exactly when their bus is due to arrive at their stop before they have even stepped outside their front door.'
Mobile and web information should be available by the beginning of 2011, and the roll-out of new Countdown signs will start a few months later.
The contracts have been awarded to telent, ACIS and Trueform.
Clare Kavanagh, London Buses' director of performance, said: 'These improvements will mean you'll never have to run for a bus again - with accurate, reliable information on bus services at your fingertips, you'll be able to find out exactly when the next bus is due to arrive at your stop.'
The new Countdown builds on the success of iBus, which provides on-board journey information on every bus in the fleet.
