How to block turning on "mobile data" in Android 4.1?

Question

Android

The button to turn on "mobile data" ("mobile data" - the Internet through the OPSOS in the absence of WiFi) is, as practice has shown, quite shallow in the menu hierarchy and close enough to other things to have a chance to be pressed by accident. Today, I didn’t somehow touch the edge of my finger when I climbed through the settings, or it accidentally pressed itself in my pocket, but it turned on and the operator wrote off the money in the calculation with a daily payment - a trifle, but it’s a pity, given that it’s not necessary (everything anyway, I’m at least 12 hours a day at a full-fledged computer, what the hell do I still have in my mobile phone Network) and it’s not so cheap.
Is it possible to somehow disable this option altogether, by manually editing some config, for example (there is a root) or setting a password a la like paying with a card? WiFi at the same time do not want to block. As an option, I’m thinking of forbidding absolutely everything from accessing the network via the cellular network using DroidWall, but I’m afraid the very fact of enabling the option still causes the exchange of some service packets with the operator, which in my case will again cause payment for the whole day even if two bytes have flown there.

Answer 1

Deactivate the service from the operator.

Answer 2

1. Change the APN to the wrong one
2. Disable the service Access without settings
Or completely disable the data transfer service (GPRS-Internet) from the operator.