by Edited by Lisa A. Grimaldi | August 13, 2012

Mifi deviceSeveral carriers have launched personal mobile hot spots that use 3G or 4G networks, but most require mandatory two-year contracts. Virgin Mobile's MiFi 2200 device ($99) let's users opt for a monthly subscription ($35 to $55/month) or on a per-use basis with pre-paid cards. (888) 322-1122;