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The LG Optimus Big LG-LU6800 is a CDMA (Code Division Multiple Access) unit. A network (usually a Korean network) connects directly to the unit using its unique code. It doesn`t have a sim card slot. If you want to use it, you need to contact a network provider and register your LG LU6800 for it to get signals in your area, either by prepaid or postpaid service. The device can still be used but without the network call and messaging feature since you will not be getting signals from a network unless you register it. There is a rumorred Mini-sim card slot on a model of the unit. Users use a micro-sim card instead for those unit since there is an issue fitter the prior sim card size. If you are unable to find the sim card slot (visible when you remove the battery) then you most probably have the CDMA version.
Your SD slot is for a memory card and putting a sim card into it will not solve anything. Call your mobile carrier and check with them regarding the sim card. Maybe your phone doesn't take a sim card. Go to LG.com and in the search area list LG Optimus user's manual and that should answer your questions. I looked on that web site for my LG user's manual, found it and downloaded it I WOULD LIKE TO MENTION TO THOSE OF US THAT CANNOT FIND A MICRO SIM CARD FOR OUR PHONES UNLESS YOU WANT TO PAY +$70.00 ON AMAZON. TAKE YOUR REGULAR SIZED SIM CARD TO A LOCAL CELL PHONE STORE AND ASK THEM IF THEY HAVE A SIM CARD CUTTER. IF THEY DO, THEY WILL PROBABLY CUT YOUR SIM TO A MICRO OR NANO SIM FOR FREE. IT WORKED FOR ME.
Cell phones (used in the consumer markets) use two types of "Networks" to operate. 1st is the CDMA network, it DOESN'T use a SIM card. 2nd is the GSM network, it DOES uses a SIM card. If you have a SIM card it is located directly under the battery in a slot, it looks like a tiny credit card.
Remove the back cover by holding the phone firmly then slide in the back cover of the handset. You will now see your MicroSD and SIM card slots. Take your SIM card and slide it into the slot provided with the chip facing down. You will also see a small diagram showing you which way to insert the SIM card. Now slide open your MicroSD memory card slot gate, pop your MicroSD memory card into the slot, then close the MicroSD memory card slot gate by sliding it forward then backwards.