First All Check:
1.Confirm whether same sim card is working in other h.s or not.
2.Make sure the sim slot is o.k. only try these two.
3.If all the above steps fails, check the SIM card connector pins for damage.
if so try to get serviced.
4.if ur sim card is good then it is problum form sim card ic u have u raplace it with SMD.
u can make it jumper mean u can fix this prob with out sim card is for this contact.
5.take sim connector slight up by pin then cheak by inserting sim.
6.hot air gun on sim i.c. then cheak it.
Last Option:
IF make sure that the sim card hasn't been damamged at all sO Please You Go to Service
& Sim Office and Get the Duplicate Sim Same Your No From Office Oprator
Problem will Solved Quickly
SOURCE: it says insert sim and sim card is already in it
take the sim out, use a plastic grocery bag and rub the sim card with the bag. Make sure you don't put your finger on the metal part.
SOURCE: LG Prada - can't detect my SIM
Try the SIM in another phone. SIM cards go bad.
If it doesnt work in the other phone it will have to be replaced. I
THis can also be caused if you set up a PIN code and it was entered in wrong too many times and you did not use the right PUK code to unlock it. THis will permanently damage a SIM card.
f it does work in another phone then your phone is no longer able to read SIM cards. Check with the manufacturer for warranty info.
SOURCE: LG Shine doesn't reconize SIM card
yeah you probably need a new chip due to the 3g network it might work on the other phones because they are older
SOURCE: WHY DOES MY PHONE SAYS INSERT SIM
try taking SIM and battery out placing it back in an powering on.
If you try this and it still does not work you may need a new SIM card.
Take it to a local dealer they should have a new SIM they will put your
number on it and you will be back in business.
If the new SIM doesn't not work you will now know it is your Phone, which means time for a new one.
good luck
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I should add that the SIM is a prepaid one from '3' company. I've been using it on 2G network fine due to the age of the handset. The SIM is not detected by other mobile handsets. Other mobiles also give the same message about missing SIM. I'm fairly certain that the SIM is damaged but I'm really anxious to get important numbers off the phone. Is any kind of data retrieval possible? (I'm located in Hong Kong.)
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