Speaking of T-Mobile, whether you love it or hate it, the carrier's jingle is one of the most instantly recognizable advertising staples on the American airwaves and as a ringtone on its handsets. Once the jingle is heard, the listener automatically thinks T-Mobile and you can't put a price on that level of brand identity. But will those living in the U.S. still hear the familiar notes after the merger with AT&T? A screenshot of an internal T-Mobile document says that in response to that very question, Deutsche Telecom owns the trademark to the jingle and no decisions have been made regarding the future of it in the States. Unless AT&T decides to make a payment to Deutsche Telecom for the U.S. rights to the jingle, you can assume that in a post-merger world, those notes will be history in the U.S.
source: TmoNews (1), (2)