https://www.reuters.com/article/us-tmt-conference-t-mobile-us-buyback/t-mobile-us-to-propose-significant-share-buyback-idUSKBN1DG1DV >T-Mobile US will propose a "significant" share buyback that could start in December, CFO Braxton Carter said on Thursday, a sign that the third biggest carrier in the United States is confident in its outlook after the collapse of a merger with Sprint Corp.