How to Factory Unlock An Iphone 4 Sprint?

Hi, thank you for viewing my question. My problem is about my Iphone 4. I purchased an Iphone 4 through Ebay. It's an Iphone 4 Sprint. But I have a T-Mobile sim card. Is there any way I can Factory Unlock the phone so that I can be able to use my T-Mobile sim card?

You can't. The Sprint iPhone 4 is CDMA only. It has no SIM or GSM radio. You can't use it on T-Mobile or unlock it because there's no SIM to unlock.

You have to call Sprint and they issue you a code which you use to unlock the phone. The phone will have to be restore using iTunes on a computer (you MUST do this) to finalize the unlock.