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7 June 2012, 11:58
You can now go online, underground, at King's Cross and Warren Street tube stations.
The Wi-fi has gone live on Thursday, with Oxford Circus and Green Park going live on Friday.
By the end of July, and in time for the Olympics, 80 tube stations across London will be connected.
It will be accessible on escalators, platforms and ticket halls, but not on the trains themselves.