How can I find out the Original Carrier for my Core Prime?

[AC Question]

Original Carrier

Hi, I've just been mailed a Samsung Galaxy Core Prime. I want to buy a network unlock code but need to know the original carrier for this phone. My friend mailed me this phone from the states but took out the original sim before he mailed me.

 

[B. Diddy]

Re: Original Carrier

Welcome to Android Central! Go through all of the preinstalled apps, and see if any of them are clearly from a carrier.