Sprint has started to ship its 3G/4G 250U USB WWAN modem that will offer full channel availability by the time mid-July rolls around, and is the first device from Sprint that boasts native dual-mode support in OS X to keep Mac owners smiling from ear to ear. Not only that, it also boasts twin antenna ports, and being rather small in stature, it should logically be an alternative purchase to seemingly more fragile WWAN modems out there. If you’re interested in picking one up, it is going for free if you don’t mind signing up for a two-year data plan.