I want to active code windows phone lumia 710...
Hi Nidapa Kamklan,
I'm not sure what you are requesting. If you want to unlock your Nokia Lumia 710, you'll need to contact the Phone Carrier to which the phone is currently locked. They'll usually have an "ego flash screen" that shows for a second or two when the phone boots.
If you want to activate your Nokia Lumia 710, this is also done via your chosen phone carrier. When you purchase a SIM, they'll activate the SIM according to the type of account you have with them.
If neither of these answers your question, would you please restate your question and provide more specific information.
I hope this helps!