Does iOS give permission to turn on or turn off cellular data within an app?

Question

For example, is it possible to make a widget so that I can turn off cellular data in the Today Widgets?

Without jailbreaking, does iOS give the permission to turn on cellular data?

Answer 1

No, not at a device level. However you can configure your application to not use cellular data.

There is no programmatic interface to disable cellular data.

Answer 2

What do you actually try to achieve: Do you want to turn off the use of cellular data for the whole phone, or do you just access a URL without possibly making it costly for the user because of cellular data?

For the latter, that's an option that you can set before each individual download.