[watch "iPhone addy hack for introverts" on YouTube; 1:35 minutes]
This is so dirt-simple and so effective it will blow your mind. And you don't even have to watch the video, although it's kind of a cute one, complete with A SURPRISE PLOT TWIST, so maybe you might want to.
Here's the deal: many, many introverts hate answering the phone. Hell, as far as I can tell, there are a fair number of extraverts who hate answering the phone. The phone sucks! Except when the phone is awesome, like when it hooks you up with your fave people who cheer you up and make your life nicer and better for five minutes.
So what you do is, dirt-simple, remember?, assign a nice photo to each person you need or want to talk to on your smartphone. Er, iPhone, I'm pretty sure you can do this with any phone that has a camera, but I'm Apple-centric and what do I know from other telephonic devices? Nothing, that's what.
Bonus-extra ridiculous-but-useful tip: if there is someone you really, really do not want to talk to but must for some reason, name them something cute in your address book ("Rainbows and Flowers!" "Ice Cream and Doilies!"), pick an adorable picture of bounding puppies or bunnies in cups, and you will answer every stupid, hateful call with a secret smile on your face. Or, you know, just smile as you watch them go into voicemail.