科普篇 Not Only Have I seen the Future I ve Got If Ringing in My Pocket The brave new world of cellphones has finally arrived in theU S. I m not talking about what are currently referred to as 19 smart phones or communicating PDAs, which are basical ly miniature computers- relatively expensive, hard on batter ies, and designed more to run PC software than to succeed as phones.I m talking about real, honest to-God, lightw eight pocket-sized cellphones. They look and feel every bit like the cellphones we ve gotten used to over the past few years. But they also have the capabilities of computers, with enough mem ory to store and run programs, and small color screens with pretty good resolution. They can transmit and receive data much the way computers do when they ve plugged into a local area network I recently got one of the phones, a Motorola T720, which comes with phone and data service from Verizon and uses Qualcomm s Brew operating environment. That probably sounds greek(or geek) to most of you, but no matter. What s important is that, for me, the experience of getting the phone