Instructions on inserting/removing your SIM can help with activation issues/errors, browser connection problems, and a blank/frozen screen.
Caution:
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Don't attempt to insert the SIM card while the device is powered on. Doing so may harm the SIM card and/or the device.
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Don't modify or alter your SIM card. Refer to these additional 4G SIM card do's and don'ts.
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Ensure the device is powered off.
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From the right edge of the device (display facing up), remove the card tray.
Utilize the insertion/removal tool (or a paperclip) to unlock the tray by inserting it into the provided slot (figure 1) then remove the tray (figure 2).

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Insert the SIM card into the tray as shown (gold contacts facing down).
Ensure the card fits into place.

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Insert the card tray (gold contacts facing down).
Press in on the tray to lock it into place.

Check out this interactive demo for more info.
Related Topic: Remove SIM Card