How To Install Sim Card In Tablet

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Insert or Remove SIM & Memory Bill of fare

Insert or Remove SIM & Memory Carte du jour

Install and remove the SIM and memory menu (MicroSD).

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INSTRUCTIONS & INFO

The Missing SIM icon will be displayed in the Notification bar when there is no SIM carte du jour in the device.
The SIM tray is located on the upper left side of the device. To insert the SIM card, open up the SIM slot cover on the side of the device.
Insert the SIM card into the SIM tray, with the gold contacts facing down and the notched border on the upper right. Gently press the SIM carte in until it clicks into place.
The microSD tray is located on the upper left side of the device beneath the SIM carte slot. To insert a microSD bill of fare, open the microSD tray cover on the side of the device.
Note: This device can employ a microSD menu upwards to 128 GB.
Insert the microSD bill of fare into the microSD tray, with the the gilt contacts down and the notched border on the lower correct. Gently press the microSD card in until information technology clicks into identify.
Note: MicroSD/memory cards expand the storage capacity of device and are sold separately. To forestall data abuse, it is recommended to unmount your retentivity card before removing it. To unmount your memory card, selectSettings app > Device maintenance > Storage > Bill of fare icon > Storage settings > SD carte du jour > UNMOUNT.

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Source: https://www.att.com/device-support/article/wireless/KM1319375/Samsung/SamsungT377A