https://www.reuters.com/article/us-sprint-corp-altice-usa/sprint-shares-plunge-after-t-mobile-merger-talks-called-off-idUSKBN1D620V >Sprint Corp's shares fell more than 13 percent on Monday after the No. 4 U.S. wireless carrier called off merger talks with T-Mobile US Inc and a wireless partnership with cable company Altice USA failed to appease investors.