First of all lets clear the basics and then we goto the tutorial.
What are Unlocked Cellphones? and Why anybody would want to Unlock it?
An Unlocked Cellphone is one that can be used on all networks operating on the frequency the phone is designed for. For example, in the UK there are four main networks, Vodafone, BT Cellnet, Orange and One2One. Vodafone and BT Cellnet operate on GSM900, while Orange and One2One operate on GSM1800. A UK dual band phone can operate on GSM900 and GSM1800, therefore being capable of working on all the networks.
However, as the networks don’t want to lose you as a customer, when they supply the phone (on contract or pay as you go) it can be locked to only accept SIM cards from their network.
If you wish to use a SIM from a different network, the phone needs to be unlocked. 
How do I know if my phone is locked or unlocked?
There are two ways to check if your phone is locked/unlocked. Firstly, if you have a working SIM from a different network, try putting that into the phone and switching it on. If the phone works and you can make calls on that network, congratulations, your phone is already unlocked. If a message appears, saying "SIM card not accepted” or similar, the phone is probably locked.
How to Unlock your Cellphone?
It is very simple procedure.
1.Download & Install ” Unlock Code Calculator”
 2.Start the software and Select your Cellphone Manufacturer and Cellphone Model
3.Enter the 15 Digit IMEI Number of your Cellphone. You can get IMEI number for your Cellphone by entering *#06# in your Cellphone and press Enter.
4.For Nokia Users you also need to select the Country and the Operator of your Cellphone.
5.Press Calculate and it will generate a Code similar to #pw+CODE+n#.
6.Now Press the Help button. Select your Cellphone Manufacturer and you will find the Steps of to use the above generated Code to unlock your phone.
Note (For Nokia Users): You might be confused by the DCT-2, 3 and 4. Here I have categorized different Nokia models into DCT 2, 3 or 4. If your Cellphone is not listed below it might be possible that it use Nokia DCT1 or 5. The List below is not exhaustive. I have prepared it by collecting it from internet.
Nokia DCT2: 3110, 8110, 8110i, 8146, 8148, 8148i, 9110, 9110i
Nokia DCT3: 2100, 2190, 3210, 3285, 3310, 3315, 3320, 3330, 3350, 3390, 3395, 3410, 3610, 3810, nk402, nk503, nk702, 5110, 5110i, 5120, 5125, 5130, 5148, 5160, 5170, 5180, 5185, 5190, 5210, 5510, 6090, 6110, 6110i, 6120, 6130, 6138, 6150, 6150e, 6160, 6161, 6162, 6185, 6190, 6210, 6250, 6290, 7110, 7160, 7190, 7290, 8210, 8250, 8260, 8270, 8290, 8810, 8850, 8855, 8860, 8890, 9000, 9000i, 9110, 9110i, 9210 y 9290
Nokia DCT4: N-GAGE, N-GAGE QD, 1100, 2110, 2300, 2600,2650, [NEM-2] (United states), 3108, 3100, 3120, 3200, 3220, 3300, 3510, 3510i, 3530, 3550, 3585, 3590, 3595, 3600, 3610, 3650, 5100, 5140, 6100,6170, 6200, 6220, 6230, 6260, 6310, 6310i, 6340, 6390, 6500, 6510, 6590, 6600, 6610, 6610i, 6630, 6650, 6800,[NSB-9] (United States),7200, 7210, 7210i, 7250, 7600, 7610, 7650, 7700, 8310, 8310i, 8350, 8390, 8910, 8910i, 9210, 9210i, 9290, 9500
Download Here! http://www.ziddu.com/download/8194135/NokiaUnlockCodeGenerator.zip.html
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