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Sorry to hear that you're not able to unlock your phone.
Before contacting Orange to get the unlock code, did you perhaps try entering any random codes? You only have 5 attempts at entering the correct unlock code and if you enter wrong code 5 times you will not be able to unlock it using the correct code.
You can see if you have any attempts left by starting it without a SIM-card, dial *#*#7378423#*#* and select Service info -> SIM lock. If you see [X] next to Network and then "0" this means that you have entered wrong code too many times. In that case i recommend that you contact your local support team to see if they can help you.