BELLEVUE, Wash.--(BUSINESS WIRE)--T-Mobile US, Inc. (NYSE: TMUS) (“T-Mobile”) announced today that it is commencing a registered public offering of 17,391,305 shares of its Mandatory Convertible Preferred Stock, Series A, with a liquidation preference of $50 per share. T-Mobile expects to use the net proceeds from this offering for general corporate purposes, including capital investments and acquisition of additional spectrum unrelated to spectrum it may obtain in the Federal Communications Co