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Hi, Your Nokia 1800 is locked to its Network, that's why it shows "Sim not valid". In order to use other carriers, you need to unlock your phone. You can do this with Network unlock code. You'll be able to get this code from your service provider. If not you can get it from online sites. To have a clear picture on how to unlock your phone using the code, visit Mobileunlockguide.com , this site gives you free instructions on how to unlock your cell phone.
If the Mobile Phone work with Only one Sim means it locked to that Network , which Network Sim card it working with?You have to Unlock it from that Network Lock,then you can use it with any GSM Network Sim card,You can Unlock it using the Unlock code from here
it is easy to get!
call the service provider of your sim card like airtel customer care if using airtel, vodafone helpdesk if using vodafone!! then will ask u the number, sim number which is on the sim card and the name of the registered owner!!
for futher help reply with details!
reply and rate!
The reason why the phone is asking for a code is because its detecting a new sim. It's asking for a security code- every brands of phone has it for security everytime you insert a different simcard. If you surf at website of ZTE, try to log at their URL for security code reference. I'm kinda not familiar for the security code of your phone. Unlike Nokia handsets, its default security code is 12345. For Sony Ericsson, its 0000.
I hope my suggestion will help you with your problem. Good day.
SIM pin code: This is a pin code that locks the sim card until you enter the correct code. This protects your account, even if your sim is put into another handset. To reset it, you need the PUK code: Pin Unlock Code (PUK) If you miss key (or forget) your SIM pin code, and enter the wrong one 3-5 times in a row, the SIM will lock up, and you’ll need to enter the PUK unlock code to release it. You should ask your Network Service Provider for this code when you need it. Don’t try to guess it, because after a few wrong guesses, the SIM card will be permanently disabled. Phone Security Code: This locks the handset, as opposed to the sim card. You can also set some handsets to only accept a “new” sim if the phone security code is entered. To reset it, you need the Master code code: Master Reset Code
Sometimes known as the Master Code, this allows you to unlock a handset if you have entered the Security Code wrongly too many times.
The default security code for Nokia is 12345 I need the IMEI (International Mobile Equipment Identity) number. Type this code in your phone to get it: *#06# you can also find it beneath the battery. Then I’ll give you the Master code to reset your Security code.
"Confucius he say: He who sits on tack is better off."