Like a pair of sparring partners in a Shakespeare comedy, Sprint and T-Mobile can’t leave one another alone. The US’s third and fourth MNOs are reported to be in merger talks again, for the third time in five years. They may believe the current government would be less likely than its predecessor to throw an antitrust spanner in the works, and the largest shareholders in both companies – Deutsche Telekom in TMO, Softbank in Sprint – have shown signs of still wanting to pursue a deal. For Softbank’s chair, Masayoshi Son, the goal would be to increase Sprint’s scale and compete more effectively with Verizon and AT&T, marrying TMO’s recently commercial acumen and disruptive pricing with Sprint’s ambitious network strategy…