how to input the unlock code?
Switch ON your phone with an Allowed SIM Card, then compose e.g. 1945#*5101#.
Go to "Menu" and then to "Settings" -> "Security".
Select "Network Provider" -> "Deactivate".
Now enter your Unlock Code.

I have entered an incorrect code more than 10 times.
When entering unlock codes you only get 10 attempts. There is no free solution to unlock your phone if you have entered the incorrect code to many times. The best advice I can offer is to take your phone to a professional unlocker such as a market trader or small independent retailer. They will use a direct unlock method using either a data cable or clip. These solutions are normally quite expensive to buy and unless you plan to unlock many phones it is not cost effective to purchase these yourself.

Network Code Key

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Terms and Conditions:
We are not responsible for any errors you make in providing your IMEI, your current network service, or in entering the unlock codes given. If you enter the unlock codes incorrectly, or if they are generated based on incorrect IMEI and network information from you, you may create a 'hard lock' condition on your phone that will require you taking the phone to a service location to be unlocked again. we are not responsible for the content of external websites.