I need to use this phone internationally. UNLOCK HELP!

My Iphone5:

Version: 8.4 (12H143)

MODEL: MD355LL/A

SERIAL NUMBER: F2LKT5XWF8GJ

IMEI: 99 000279 053942 1

Carrier: Virgin 20.0 PRL 31100 NAI kaitlinkoykar@virginmobileusa.com

MSID 9253004784

I really need to unlock my phone. It was a prepaid contract with Virgin for almost a year. I've been inactive with this carrier for almost a year because I live in Spain and have been for almost a year. I have the carrier Orange. Now, I'm returning to CA for the summer and I want to unlock this phone! When I first arrived to Spain, I contacted Virgin Mobile and had three people refuse to help me because my contract is no longer active. I was very upset. Finally after demanding to speak to a manager, I received an OEM six digit access code and was told to put the code in once I put in a new SIM card from Orange. It didn't work. I contacted Apple to try and help me, but they told me that the OEM code needs to be sent directly from my previous provider because Apple does not have power to initiate an activation policy or switch from GSM to CDMA, or however it works. I discontinued my prepaid service when Virgin Mobile told me I could not unlock my phone and use it in Spain. I discontinued a year ago. I really hope someone can help me or give me guidance. First, I want to know, which is my phone....GSM or CDMA? And two, what is the process in which I can get this thing unlocked? Any genius out there with advice would be greatly greatly greatly appreciated!!

Thank you for reading this.

Kaitlin

Here is what I get when I put in my Orange SIM card (European SIM) into my iPhone.
I don't want to have paid for a brand new iPhone 5 2 years ago, fully paid, to not be able to use it in my new home in Spain. >.<