Are you quite young @Brandnewbrighttomorrow Like under 32/33?
I'm not being patronising (honestly!) I just ask this, because that generation (born after 1990) tend to hate speaking on the phone - even to their friends and family. It's got to be whatsapp or texting, or intagram, twitter, or facebook.
I know a 19 y.o. right now who huns and babes and LOLs with people on twitter and whatsapp, but runs a mile to avoid speaking to them in real life if she spots them. Utterly bizarre.
I also know a few under 30s who don't answer their mobile phone (90% of the time,) even to their mum, but then message 2 minutes later, saying 'soz was in shower. Was it important, off out in a minute...' Obvious bullshit. They simply can't be arsed to speak.
Even my own DC (mid 20s) do this sometimes. If I don't answer the phone when THEY ring however, they bitch and moan, and tweet and whatsapp me repeatedly 'WHERE ARE YOU MUM?!!! ARGH!!!' 
Oh and YABU, a bit. I do get that a phone call can tie you up a bit, but it's weird to never ever want to speak on the phone.