Lock Mobile Data

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http://androidforums.com – I have a Samsung galaxy s3 with jellybean! I just cancelled my mobile data from my provider! I used it something like 2 to 10 mb a mounth because I only use it at home or at work! besides that there are so many free wifi that i never have any problems getting coveriage witch is faster then mobile data! Now to my question: Is there a way (maybe a app) that lock my acces to mobile data? more then just the on off butten I would prefere to write a password to be enable acces mobil data. To be sure i dont accedently enable it i would like to lock it! (General)