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What is a typical cell phone signal strength and range inside a home?

The signal will be stronger the closer you are to the interior antenna. Other factors that affect the improved coverage area include proximity to cellular towers, unit placement, the type of walls in the home and signal strength outdoors.

You should expect improved indoor coverage and you will be able to make calls where you weren't able to, before. The amount of improvement will depend on a number of factors. Cell phone booster products are designed to bring outside coverage inside. If you need an even stronger signal, a directional indoor antenna or a more powerful external antenna might be considered. If you would like to read further, here's an article that helps explain how to calculate coverage area you can achieve indoors.