Instructions on inserting/removing your SIM can help with activation issues/errors, browser connection problems and a blank/frozen screen.
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.
Ensure the device is powered off.
From the left edge of the device (display facing down), remove the card tray.
Utilize the insertion/removal tool - or a small bent paperclip - to unlock the tray by inserting it into the provided slot then remove the tray .
With the gold contacts facing up and the notch located in the upper-left, insert the SIM card into the tray as shown then insert the card tray.
Ensure that the card fits into place.
Press in on the tray to lock it into place.