My guess is that he knew that the New T-Mobile will be significantly different and wanted to go out on the top of his game which he did (with a huge payout too). His job is done basically.

Company went from joke to powerhouse with a huge assist from AT&T of course after they paid T-Mobile a huge breakup fee for that non-merger. But he also initiated their heel turn by this Sprint merger, a merger no one wanted but shareholders and executives. And the impact is going to be felt in the coming months and years and not in a good way.

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