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7 hours ago · An operating system ( OS) is system software that manages computer hardware and software resources, and provides common services for computer programs . Time-sharing operating systems schedule tasks for efficient use of the system and may also include accounting software for cost allocation of processor time, mass storage, peripherals, and ...
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7 hours ago · Using the wrong SIM card size: The ZTE N817 uses a nano-SIM card. Attempting to insert a standard SIM or a micro-SIM will not work. Attempting to insert a standard SIM or a micro-SIM will not work. Inserting the card upside down: Ensure the gold contacts on the SIM card are facing downwards when inserted into the tray.