The Wilson Sleek is the only affordable device at the moment that will provide both 4G and 3G amplification for smart phones. It can be used with a tablet or iPad but its cradle isn't designed for an object that large. However, if you Velcro'd it to the tablet it should work reasonably well. Using your phone as a hot spot does not cost extra if your carrier is Verizon and you are using one of the Shared Everything plans.