Pretty much all cellular service providers can block individual numbers from being able to reach you, you just have to call up your customer service number and ask them to do so.
As for the phone, your friend has what is a widely used idea. You set the default to something you can live with- and in your case, sleep through- and then your individual numbers in your phone book get a real tone, and then they come through. That would be your "allow" list.
There's no way of preventing wrong numbers, so that's out. It's human error.
I don't have a landline either, they're useless. Haven't had one since 2000.
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