Anyone Know the Band Playing on T-Mobile Commercial?

Don't know which spot you're referring to, but this site helps you locate music, actors and other aspects of commercials. 

https://www.ispot.tv/

Thanks for the response but I can't make heads-or-tails out of this website.

Use Shazam on your phone to tell you. I’ve found a bunch of new music from TV show and movie soundtracks.

Thanks, but I don't use my phone for this kind of activity, only computer.

I wouldn't go through this hassle but it's a cool song and, by now, I'm sort of obsessed.