Why Weak cell phone signals inside house?

Answer 1

building often have metal inside them that causes interference, rebar in concrete buildings, wire mesh in sod buildings, and building with metal roofs. Metal covering your cellphone leads to weak signal.

Answer 2

Weak cell phone signals indoors can be due to obstructions such as walls, buildings, and trees that block the signal from reaching your phone. Additionally, the distance from the nearest cell tower, the material of the building (which can block signals), and interference from other electronic devices can all contribute to weak signals inside a house. Using a signal booster or Wi-Fi calling can help improve reception.