Can you unlock an already unlocked iphone?

I unlocked an att iphone to sprint. Now i'm wondering if i can unlock that iphone again so it can work with metro

As of my knowledge, once a phone is "unlocked", it should remain unlocked. I unlocked my iPhone through www.cellunlocker.net and it remained unlocked.

Once an iPhone is unlocked, it is permanently unlocked.
Therefore, all you need to do is take a visit to Metro and they will write down some details about the iPhone and have you all setup with their service on that iPhone in about 10-15 minutes, assuming you don't need to port your number from Sprint.

Factory reset your iPhone. Everything will be fixed.

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