How do I block calls not reachable?

Third-party apps

Some apps like Phone Signal Jammer, Call Blocker, PilferShush Jammer, Call Control, Cell Phone Signal Blocker pouch, etc., claim to block cell reception and thus make your number unreachable. While these apps are free to use, we recommend that you test them on your device first.

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How do I avoid phone calls so that the caller hears the message mobile phone out of coverage area?

Just block the numbers of people whom you don’t want to talk. When they try to call you, they will hear the dialogue “this number is out of coverage area” or “this person is speaking with someone else”.