Cradlepoint, a Boise-based mobile router company, has secured an investment from Highway 12 Ventures, as announced on Highway 12’s blog. Cradlepoint is a company that makes fantastic 4g/3G wireless routers.  Using Cradlepoint’s devices, a user can take an existing mobile broadband card from Verizon, Sprint, T-Mobile, or AT&T (or any other carrier, for that matter)…