Fact: most phones last. Thing is, for us (and likely many of you), they last far longer than our clinically-diagnosed Gadget Attention Deficit Disorder would ever tolerate — but for your dad, your sister, your college buddy with the hand-me-down ZEOS Pantera running Windows 95, or anyone weary of re-upping a two-year commitment, a handset can easily become a serious long-term investment. That helps explain why Motorola’s venerable RAZR series remains staggeringly high on Nielsen’s latest US phone usage report — third place, to be exact, at 2.3 percent of all subscribers behind the iPhone 3G at 4 percent and RIM’s BlackBerry Curve line at 3.7 percent.