How to disable Wi-fi completely?

[Poes]

I want to use my old S4 Mini as a Bitcoin wallet. The problem is that I need to completely disable all wireless communications (GSM/Wi-fi/3G) for that.

Is this possible on the stock rom? I know I can just turn on airplane mode and remove the sim-card, but I saw apps turning on Wi-fi all by themselves, so that doesnt feel safe enough. Is there a better method?

Also, if someone is willing to develop a custom ROM for me, which completely strips everything that has to do with wireless, Im willing to pay for that.

 

[XxM4tzexX]

Which apps are there which turn on wifi by themselves without asking for permission??
If you have root you could manually break your wifi or anything else by deleting the appropriate files/libs in the system folder.