I don't like telephones and consequently I don't answer my office one. Nevertheless you can ring it if you want to hear a message explaining that I never answer my phone. I'm sorry, I really am, but voices without faces are just weird and make me anxious:

+44 (0)1273  877150

If you're my friend, you'll have my mobile number and you can ring that because it plays a nice tune that makes me happy when it rings. As your reward (or punishment, depending on your perspective) I will answer it.