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The SIM card tray is a removable slot designed to securely hold the SIM card in a mobile device. It is usually located on the side or top edge of the device. The tray is engineered to fit the specific size and form factor of the SIM card, ensuring a snug and secure placement. To access the tray, users often need a SIM card ejector tool or a small paperclip to gently open the tray compartment. Once the tray is open, the SIM card can be inserted or replaced, enabling the device to establish a connection with the cellular network. The design and location of the SIM card tray may vary between different smartphone models.