► Subscribe to the Financial Times on YouTube: http://bit.ly/FTimeSubs<br /><br />T-Mobile's meteoric rise under the iconoclastic John Legere has been astonishing. But its emphasis on market share over profits may come to bite it - a feeling Amazon's Jeff Bezos knows well.<br /><br />Make better investment decisions with Lex<br />http://www.ft.com/lex<br /><br />Click here for more Lex videos<br />http://video.ft.com/Lex<br /><br /><br />For more video content from the Financial Times, visit http://www.FT.com/video<br /><br />Subscribe to the Financial Times on YouTube; http://goo.gl/vUQx5k<br />Twitter https://twitter.com/ftvideo<br />Facebook https://www.facebook.com/financialtimes