Unlock Sprint Samsung S5 SM-900P

I just bought a Samsung S5 from Target with Sprint carrier. Model is SM-G900P Is there a way to unlock it for International use? When I insert a foreign SIM card it is invalid.
The phone hasn't been activated or has service/contract with Sprint, no mobile number either.
Everyone has told me to call *2 or Sprint customer service but they ask a mobile number to get human. No luck there.
14 days have passed so Target won't accept a return. Internet search has other carriers listed for buying an Unlock code but not Sprint (or SM-G900P)
I have tried to place the phone into Sprint Prepaid to get a mobile number but the IMEI isn't accepted or invalid.

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