Use Remote unlocking service to unlock your iPhone 4. You can get it from any of the online service providers like http://www.theunlockarena.com/apple-iphone-4/rs13wp9/ to unlock your iPhone 4. Here, you need to specify your Network and Country to get unlocking service from them .
Hi Julie. You can check first with your carrier if they unlock iPhones. Some carriers even offer this service for free if you meet their requirements. You can also check YouTube for videos or Google for information on how to unlock your iPhone with the use of programs such as Ultrasn0w. The process just takes a few minutes.