Ionic Airplan mode no off

how to on off airplane mode ionic 3

You can’t. At least in IOS the access to change the airplane mode is restricted and it does no have any public API, so a plugin to do it can’t to be developed. And if you use some kind of private API, the app will be rejected by the AppStore when you publish it.

Take a look on these:

Let us know what are you trying to achieve, maybe there is a workaround to get it done.