5G runs on different radio bands with very different characters. High frequency bands offer blazing speed but travel short distances and are easily blocked, while lower and mid bands cover much wider areas and penetrate buildings but with more modest speeds.
This is why 5G can feel dramatically fast in one spot and ordinary elsewhere, as networks blend bands to balance speed and coverage. Dense cities may use high bands for capacity, while wide areas rely on lower ones. Understanding the mix explains the uneven experience and why blanket claims about 5G speed rarely match everyday use.