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The most common thing for any mobile/cell phone.
Easy fix simply take an eraser & rub over the contact of the sim card then making sure not to touch the sim cards chip re-insert in to the phone & it should be problem solved. If the problem still exists insert in to another phone if possible to test the integrity of the sim card if the sim card works in another phone it could be the phone you are attempting to use it maybe faulty or the sim card is incompatible or the phone is not unlocked entirely, if it doesn't work in another phone the sim card has failed & a new sim card is required.
If your LG CU500 says Invalid Smart Chip,It's locked to some network...You need to Unlock it from service provider lock to use other CHIP(sim card)..find the current network,country it's locked now and get the unlock code from the site Simpleunlocking.com/lg-cu500/rs16wp9/ for LG CU500 and unlock it easily.
If the LG VU CU920 Says Invalid Sim means it locked to network.You need to Unlock it...You can get the Unlock code from here Simpleunlocking.com/lg-vu-cu920/rs16wp9/ and Unlock it from network lock...Find the Network ,Country it locked now..Then unlock it.After Unlock it use with any GSM Network Sim card.
You have to take the battery out and you will see a slot for your sim on the right side. Make sure the gold connectors are pointed downward and the angled corner is pointed outward, meaning that the angled corner does not go in first.
The first thing to try is cleaning the contacts for the smart chip, on the phone and the chip itself. Use a little rubbing alcohol on cotton buds and be careful you don't bend the contacts in the phone. If that doesn't remedy the problem, get your service provider to give you a new chip. They should be willing to give you one for free. If that doesn't fix it, then it is probably a phone problem. You may go to your service provider or any nearest mobile phone repair shop to have it fixed. You may also have the phone replaced if your budget allows it.
Resistors? You mean the smart chips?
Here's something I found over the last few years of dealing with these newer laser printers.
Say for example you had a 13,000 page factory toner, you replace it with a 20,000 page aftermarket refill, but you trade off the chip. There are small case triggers that read the toner size (I still haven't figured if it's internal or external) The chip is programmed for a specific cartridge size. The carts don't match, the chips won't work.
Also, certain printers will recall chips that have been used, and won't let you reapeat chips until you have gone a certain number (like it has to have 4 or 5 different chips before you can reuse the first chip).
So options to get around it.
I found in the Dell printers, if you go through the menus, there is a setting that allows you to bypass using factory cartridges, I don't know if Samsung has the same menu settings, but it's worth digging through the layers.
2) Put the chip that came with it back in, and see it it will work.
3) Break down and buy a factory cartridge. I know this is the least attractive option, but it will determine if it is a read sensor, a firmware/software error, or something else.
The whole smart chip imbedding happened about 7 years ago as a settlement on a lawsuit.
Your cellphone will only work with Cingular/AT&T smartchip. What kind of smart chip are you trying to use with LG CU400. I believe no other smartchip will do.
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