I am a representative of a cellular operator. For some of our clients,Tethering mode does not work. How can you check and find out what is the reason, is there a prescribed algorithm somewhere, how does the iPhone check it?
How the iPhone checks if a Tethering is available
Is Teethering specific to this operator ?
have you seen this: https :// w w w. t-mobile. com/support/devices/apple/apple-ios-11/tethering-apple-iphone-and-ipad-on-ios-11