v1.6.1 Fixed gaps in the blocking logic, and as a test, a lock is implemented and when calling the Engineers by standard code (*#*#3646633#*#*).
v1.6 Added the ability to deny access to the Engineering Menu through this application. (Protection from children and strangers)
To do this, dial in the dialing code: *#*#505#*#* .
To return access, you need to dial the same code again.