Apple is working to resolve the issue with iOS10 for @TMobile customers. Don't download iOS10 if you currently use an iPhone 5SE, 6 or 6+— John Legere (@JohnLegere) September 15, 2016
T-Mobile's foul-mouthed faux-rocker CEO John Legere is telling his customers not to download the latest iPhone OS, iOS 10. Shortly after the message went out, T-Mobile customers started asking what to do if they'd already installed the OS. The answer came from CTO Neville Ray.
If you have iPhone 5SE 6 or 6+ & already updated to iOS 10 and see issues, temp fix is to restart your phone every time you lose connection.— Neville (@NevilleRay) September 15, 2016