You may find it difficult to use you cell phone inside a metal building because metal buildings block the microwave signals needed to conduct a clear and steady signal connection. Technology can assist cell phone users to lower the instance of dropped calls in metal buildings, but they cannot eliminate dropped calls completely. Tools to help refine signal transmission and strength to strengthen the quality of cell phone calls can be purchased at electronic stores.
Buy an external antenna and a power booster. Purchase connector cables separately if the external antenna or power booster does not come with one.
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Locate the RF (radio frequency) port on your phone and plug in the power booster to the RF port. Check your cell phone manual if you're not sure what the RF port looks like.
Place the other end of the power booster cord into an electrical outlet.
Plug in the external antenna to the power booster.
Use the phone, placing calls as usual.