Dead Zone ads may be creepy, but they capture the essence of a problem familiar to many cell phone users: When you're indoors, even within your carriers coverage area, the networks signal sometimes simply is not strong enough to support voice calls or data services. A slew of products now address the problem--but they do not come cheap.

The signal-boosting products generally fall into one of two categories: femtocells or signal repeaters. Both types of equipment can deliver strong signals within buildings, but they work in fundamentally different ways.

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