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Your phone is unlocked. The problem IS the phone doesn't support Sprints network even if it is unlocked. It needs CDMA which the AT&T and T-Mobile versions of the iPhone does not support. You will need A1863 or A1864 to work on Sprint.
Found on that website from Apple -
Models A1905 and A1897 do not support CDMA networks, such as those used by Verizon and Sprint.
I have the same issue. Before I purchased the iphones I asked if they can be used on any major carrier, including Sprint, T-mobile said yes. Now I'm stuck with a iphone that is locked to GSM. I think this can be considered fraud. Going to report to local news.