Bellevue, WA-Based T-Mobile US 4Q 2017 Pretax Income Increased Very Nicely By 18% Over the 4Q 2016 ....................................................................................... But That Was Peanuts as Compared to Its Spectacular 594% or $2.317 Bil After-Tax Net Income Growth in the 4Q 2017 ($2.707 Bil in the 4Q 2017 vs $390 Mil in the 4Q 2016) ....................................................................................... $2.200 Bil or 95% of the $2.317 Bil 4Q 2017 Net Income Improvement From the 4Q 2016 Was Due to the US Trump Tax Cuts Act, Primarily Resulting From the Puzzling, Very Lucrative US Federal Income Tax Debt Forgiveness Feature in the US Trump Tax Cuts Act ....................................................................................... And From a Fairness Standpoint, Whereas Competitors AT&T and Verizon Have Both Lowered Their Number of Employees Year After Year, T-Mobile US Has Done Just the Opposite