Hey Jsexxx,
From the information you provided, it appears that is the carrier settings version. It's located in Settings > General > About next to "Carrier". If you're not seeing the carrier's name next to "Network"or before the number next to "Carrier", you would need to take other steps to determine it.
If there is a SIM card still in the iPhone, the information on it may help. If you received the iPhone second hand, check with the person that you purchased it from or that gave it to you.
For more details about unlocking your iPhone to use with a different carrier, click here: How to unlock your iPhone for use with a different carrier.
Take care.