Explanation:
Smartphone transmissions interact with matter primarily through electromagnetic waves. These waves can penetrate materials to varying degrees depending on their frequency and the properties of the material. For instance, higher frequency waves like those used for 5G networks have shorter wavelengths and can be more easily absorbed or blocked by obstacles like walls or foliage compared to lower frequency waves.
To block smartphone transmissions, various methods can be employed. One common approach is using materials that absorb or reflect electromagnetic waves, such as certain metals or specialized coatings. Additionally, signal-blocking devices or structures can be deployed to prevent transmissions from reaching certain areas. However, it's important to note that deliberately blocking smartphone transmissions may have legal implications and should be done with caution and consideration of privacy and safety concerns.