I can't let go of my Nokia mobile phone

Most people I know is using either an iPhone or blackberry, and I think I am the only one using nokia phone. Yet, no matter how left out I feel, I just couldn't let go of it. It is very user friendly and I have not experienced any problem with it since I got it 3 years ago. How about you? do you use other phone aside from iPhone and blackberry? Are you comfortable letting go of it?