Technically, it is illegal to unlock any phone purchased through a carrier in the US without the expressed consent of that carrier. What you have to do is go to your carrier and meet their six principals which are listed below.
The alternative is to find a third party SIM unlock website. You can usually find these guys on something like Craigslist.
Prepaid Unlocking Policy: Carriers will unlock prepaid mobile devices upon request, no later than one year after the initial activation.
Postpaid Unlocking Policy: Carriers will unlock or provide necessary information to unlock their devices to customers and former customers after the completion of a service contract, device financing plan or the payment of an early termination fee.
Notice: Carriers that lock devices have to notify customers that they are eligible to unlock their devices when eligibility occurs or will automatically unlock devices remotely when they are eligible.
Response Time: Carriers will unlock eligible devices within two business days of receiving a request.
Deployed Personnel Unlocking Policy: Carriers will unlock mobile devices for deployed military personnel for customers in good standing.
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