7.1 Unlock carrier?

[GoodaBrine]

How do you unlock your carrier for free? iPhone 4.

 

[eyoungren]

You call your carrier and ask for an unlock.

If that isn't free for you then I can't help you.

Software unlocks via jailbreaking died over five years ago.

 

[Applejuiced]

What Eric said above.
There is no software unlock hack available.
You can try contacting the carrier to ask for an unlock or pay for a 3rd party IMEI unlock.