Apple - Smartphone Antenna PerformanceFind out how the iPhone 4 antenna performs alongside other smartphones.Every smartphone has a cellular antenna. And nearly every smartphone can lose signal strength if you hold it in a certain way. To demonstrate this, we tested iPhone 4 alongside other smartphones. Understanding attenuation and signal loss. The opposite of amplification, attenuation happens whenever a signal is obstructed. All an
Mac - Apple （日本）
