Because 5G uses higher frequencies, the signals do not travel as far and are more easily obstructed by obstacles like buildings and trees. This means that 5G networks may not be as widespread or consistent as older technologies. The cost of implementing 5G technology is expensive.

5G signals do not travel as far as 4G primarily because they often utilize higher frequency bands, specifically millimeter waves (mmWave) in the 24GHz to 100GHz range. In physics, higher frequencies have shorter wavelengths, which are much more easily absorbed or blocked by physical obstacles like buildings, trees, glass, and even rain or atmospheric moisture. While a single 4G tower can provide coverage for several miles because it uses lower frequencies (sub-6GHz) that can "bend" around obstacles and penetrate walls, a 5G mmWave signal has a very limited range of about 300 to 500 meters. To compensate for this, 5G networks require a much higher density of "small cell" towers placed closer together, often on streetlights or buildings. This trade-off is necessary because these high frequencies provide the "massive bandwidth" and ultra-low latency required for the high speeds of 5G, but it means that the signal strength drops off sharply the further you move from a transmitter or if you step behind a thick wall.