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T-Mobile CEO John Legere. Updated story: Apple has addressed and fixed an issue with iOS 10 that was causing T-Mobile customers with iPhone 5SE, 6 or 6 Plus to lose connectivity this week.

In a tweet posted late Tuesday, T-Mobile CEO John Legere said that the carrier's iPhone 6S preorders are up more than 30 percent over preorders from last year when the iPhone 6 was released.