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Cellular phones have quickly become the essential part of our everyday lives. It is not surprise that last couple of years we see more reports that medical equipment doesn’t work properly because of cellular phones. Cellular phones cause harmful interference for medical equipment. This is serious problem that can cause anything from minor inconveniences to serious injuries or even death. There are number of studies that show if cellular phone is being used near …

…wings. Results were compared to calculations made using free-space propagation method. Results showed that free-space overestimated measured fields of interference in gyprock rooms, and along corridors of both gyprock and clay-block construction. However, the free-space model underestimated field of interference in clay-block rooms, and in below-ground corridors. Therefore administration of hospitals should pay a lot of attention to how hospital buildings were build, and what type of medical equipment is being used in those hospitals.