c.e.o. john legere there.g up, how has technology changed the war on terror 13 years after the september 11 attacks? how have terror groups changed in the age of social media and cyber hacking? we take a look at all of these questions with former homeland security secretary michael chertoff next on the best of "bloomberg west." ♪ >> welcome back to the best of "bloomberg west." i'm emily chang. 13 years after the september 11 attacks, the united states is back on the offensive confronting terror groups like islamic state. president obama announced a broad based coalition to confront them. >> i have made it clear we will hunt down terrorists who threaten our country wherever they are. that means i will not hesitate to take action against isil in syria as well as iraq. this is a core principle of my presidency. if you threaten america, you will find no safe haven. >> while the fight against terror continues, technology is changing everything from the way we gather intelligence to the way terror groups broadcast

c.e.o. bill ready. t-mobile is doubling down on wi-fi. i'll speak with john legere the latest move on the best of "bloomberg west." ♪ >> you're watching the best of "bloomberg west" where we focus on innovation, technology and the future of business. i'm emily chang. on the heels of apple's new product announcements, t-mobile made some headlines of its own. the uncarrier announced several updates to use wi-fi calling, a personal cell spot, and free w f -fi. i went to their event in downtown san francisco and sat down with john legere himself. i started by asking how many uncarriers can we expect? this is the seventh one. >> as many as we have aim points in the industry that need to be solved. one of the things we talked about in the session here was a trivia test to ask people when do you think was the biggest growth month in the history of t-mobile. everybody had a lot of guesses and the answer was august. the momentum of the company is great, and we unleashed wi-fi, which means every single device we sell from now on will be fully wi-fi enabled out of the box. eve