IPhone 5 with no service plan? International SIM?

I recently lost my iPhone 5, but I happened to have found it today. I already bought a new iPhone 5, so my old one no longer is activated/serviced by my carrier (Sprint). I'm leaving the US to Hong Kong for a couple of months so I was wondering if my previous iPhone is now unlocked. If I inserted an international SIM card into my old phone, would it work?

Call Sprint if you can have your iphone 5 unlocked to use outside the US. From what I've known it needs to be active for 90 days for them to unlock. I'm just not sure now that you have a replacement phone. Call them up and explain the situation. Yes, international SIM would work for Sprint iPhone 5 provided unlocked.

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