Exactly : I found a mobile phone only became useful once it became small enough to fit comfortably in a pocket or similar, such that I always had it with me. since I was not prepared to carry it round like a bit of street jewellery like some people used to ( some still do), otherwise it was always left somewhere or other and not available for use
whilst I am of age where I could appreciate a larger display, I think I prefer the portability over the ability to read screeds (well 160 characters) of text msg, which I never use anyway