[amself]

it's arguably much easier (nowadays) to use an off-the-shelf app like TimeLimit[0] to achieve the same kind of functionality on smartphones, without ever having to flash custom firmware using undocumented/unsupported techniques. Granted, back in <=2014 this probably made more sense.

[0]: https://timelimit.io/en/

[SonOfLilit]

The functionality the customer asked for is not having access to the Internet. TimeLimit won't cut it.