Why have you given your number to friends and family if you're not going to answer them?
There are other technologies for messaging (hangouts, WhatsApp, etc...). Also, if the issue is friends and family, OP could simply let them know to phone only in case of emergency but to use messaging at all time otherwise.
Complaining that people phone you, people who are close to you, family and friends, and proudly boasting of ignoring the calls feels very immature to me. You don't want phone calls? Don't give out your number, find alternative techs for messaging, or at the very least make it clear to people that you don't want them to call.
That's not how social interaction works. If someone asks for my number so they can text me, I happily give it to them. I'm not going to interrupt the conversation at that point to give them a lecture to never call me. They will get the point when I don't answer.
It's like telling people not to give out their physical address for mail if they don't want people to show up unannounced at their home.