Get a Cell Signal Repeater
If you have poor reception in parts of your home, you may want to consider buying a cellular repeater or booster. They essentially catch cellular signals in the air, clean up any distortion, and rebroadcast them as a stronger signal throughout your house. They’re not always inexpensive, but they may be worth it.
There’s also a type of cellular booster called a femtocell, which essentially takes a broadband cable connection and converts it into a cellular signal via Wi-Fi. While they may be a better solution, they’re becoming increasingly hard to find. Contact your carrier and inquire about a femtocell (or “microcell.”)