If you place a new or a existing SIM card, from anotherphone provider, into a different cell phone and it asks for a Security Code then:-
This phone is locked to the original mobile phone provider. Then you need tocontact this mobile provider to ask for the unlock code (Security Code) forthis phone. You need to provide proof of ownership etc and the phone's uniqueIMEI number which is located inside the phone under the battery. They use thisnumber to generate the unlock code for your phone.
You are provided, with instructions, on how to enter this code into the phone.
Once you unlock the phone, then you can insert a new SIM card, in this phone orsign up with another phone provider using this phone.
You could ring the phone provider for unlock the security code, the reason, youwish to use your phone with a prepaid SIM card from another country. This maybe a free service.
The other way to get your phone unlock is to use a phone unlocking company onthe Internet, they usually charge a couple of Dollars for their services. Thereare so many website, ready for giving the service, against their nominal chare.
You can also try this WEB site:-http://www.mobileunlockguide.com/mobile-phone/
For Nokia phone - try this WEB site too:-www.unlock-free.com/nokia-master
The IMEI number is unique the each mobile phone.
The number is printed on the label under the battery.
You can also get the IMEI number by entering this on your phone
*#06# It will then display your IMEI number and you may also get a uniqueglobal serial number. Your IMEI number should be 15 digits.
Hope this helps.
If you are helped you can rate on the 4 thumbs and leave ashort comment,because,
this is the free sideand I can get the chance, to help people like you .
You can get theunlock code through online..........give your IMEI number and get the unlockcode for your mobile.... i will suggest the website Unlock-Zone.com
which isdoing good service.....you can approach this website.
This site is nearly perfect and they were recommended highly in the cell phoneforums. I used them to unlock my cell phone. contacted them and within 30 minsIhad my unlock code and my phone wasunlocked.
Hope this helps.