What's gonna happen if I buy a locked iPhone 4 and I unlock it myself afterwards?

Scotch

New member
I mean, we all know that the locked iPhone 4 is tons cheaper than the unlocked one. I was thinking, to save my wallet, if I buy the locked iPhone 4 (you know the one around 200-300$) and then I unlock it myself cos I've seen some do it. Or have it unlocked, whichever. What's gonna happen? Is it impractical to do it that way? Thank you!!
 
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