How to change the network of my iPhone 4?

Niko

I have iPhone 4 from Japan, how can I change the network/carrier (SIM) to Globe/Smart? (Without jailbreaking)

I really don't want methods like jailbreaking, though I used it once but it didn't satisfy me.

Guest

Not jailbreaking, but unlocking is what needs to be done. Your carrier maybe able to help on that.

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