Here are some ways to improve you cell signal at home
Using a Wi-Fi extender or repeater can help boost your cellular network, and plugging in one of these devices can improve the carrier signals you receive.
If your cellular connection is inconsistent, using Wi-Fi for calls may be an option. T-Mobile, AT&T, and Verizon all offer Wi-Fi calling options, but you can also use apps like Skype.
Depending on your region, different carriers have different levels of coverage. If your service is consistently slow, consider changing carriers.