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See what the lights on your gateway mean.

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<ol><li>The Missing SIM icon will be displayed in the Notification bar when there is no SIM card in the device. <img alt="device 5158/9006420_01.jpg" src="https://www.att.com/devicehowtomedia/image/5158/9006420_01.jpg"></img></li><li>The SIM tray is located on the right side of the device. To insert a SIM card, first insert a SIM tool or paperclip into the small hole to eject the SIM tray. <img alt="device 5158/9006420_02.jpg" src="https://www.att.com/devicehowtomedia/image/5158/9006420_02.jpg"></img></li><li>Insert the Nano-SIM card into the SIM tray with the gold contacts facing down and the notched edge in the lower left. <img alt="device 5158/9006420_03.jpg" src="https://www.att.com/devicehowtomedia/image/5158/9006420_03.jpg"></img></li><li>Insert the SIM tray back into the device. <img alt="device 5158/9006420_04.jpg" src="https://www.att.com/devicehowtomedia/image/5158/9006420_04.jpg"></img></li></ol>

Insert or Remove SIM Card

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