Zte MF668A User Manual page 9

Remove the back cover

Replace the back cover.
To remove SIM/USIM card from the USB modem

Remove the modem from the computer.

Remove the back cover.

Pull out the SIM/USIM card from the card holder.
Pull out the card
2. Install memory card
You can use a compatible microSD card to save more data. Only microSD card
is supported by the modem and do not insert other memory card into the
modem.
Remove the back cover of the USB modem.

Insert the microSD card into the holder until you hear a click. Make sure

that the memory card is orientated as shown in the following picture.
Slide the card into place
Replace the back cover
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