Do I need a WiFi or cell phone booster?

There are two common types of cell boosters. An amplifier in the antennae line will generally improve signal capture and probably connection speed. The boosters that have an outside and inside antennae or a cradle where the cell phone/mifi is placed are repeaters. The cell device will get a stronger signal, but every repeater results in some speed loss so that the connection speed may not be as fast as the cell device alone. The real benefit from the repeater devices is seen when the cell device has very weak or no signal.