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SIM card tray is a small, removable component found in most mobile phones and other cellular-enabled devices, designed to securely house one or more Subscriber Identity Modules (SIM cards) and often a microSD card for expandable storage. Typically located on the side or top edge of the device, it's usually made of metal or plastic and requires a specialized SIM ejector tool (or a straightened paper clip) to be inserted into a small pinhole to release the tray. These trays come in various configurations, including single SIM, dual SIM, or hybrid slots that can accommodate either a second SIM or a memory card, playing a crucial role in enabling cellular connectivity for calls, texts, and mobile data by facilitating the secure insertion and removal of the SIM card.