With new homes and buildings in particular, the signal outside is often strong enough , but as soon as you step indoors, the signal weakens or is lost. There are various factors that can influence the strength of the signal, such as the building’s construction, the materials used (metal, concrete or wood), wall thickness, number of windows, building height, etc. In addition to the physical construction of a building, a poor signal can also be the result of the building’s geographical location in relation to the nearest mobile phone mast.