just a simple app that password protects cellular data enable

i'm on paygo data, which i keep disabled 99.99% of the time.
i only use it while i need to communicate away from various wifis.
i don't mind manually enabling and disabling cellular,
what i find maddening is i sometimes find my cellular enabled
when i know i didn't enable it - something in android just does it.
i want to put my cellular behind a password, it could be the same
password as my phone unlock, i just do not want to catch cellular
enabled when i know i didn't intend for it to be this way.