手機信號是指手機從蜂窩網絡中接收到的信號。手機信號的強弱取決於多方面因素，例如當靠近行動通信基地臺時信號強、但呆在某些建築物或者地下室時信號弱。大多數移動設備通過高度逐漸遞增的柱狀條形圖向用戶顯示手機信號的大致強度，一般條形圖上有5個柱狀。[1]
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