Here's  another tips for your Nokia Mobile Phone. To get an IMEI (International Mobile Equipment Identity) to your Nokia mobile phone , you can type a *#06# , and then after that will come up a bunch number which is your IMEI mobile phone number.

IMEI Number

IMEI number is a number that unique to every GSM and UMTS mobile phone,  unlike the Electronic Serial Number or MEID of CDMA, IMEI location is on the device instead on  SIM card, so basically it can't be transferred to other device.

The functionality of IMEI number is to identify valid devices, so again in theory if your device is stolen, you can  contact your network provider and tell them to stop the phone with specific IMEI number. This will make the phone useless even if the SIM card is changed.

So that I believe it's important to have your IMEI number, so that in case your mobile phone is stolen, your phone will completely useless.