As for unlocks there is almost no free methods to get your handset unlock. If you are lucky and own an old version of iphone u can try SAM activation exploit or Ultrasn0w unlock. But there are tons of unlock provides like http://att-iphone-unlock.com offering cheap factory unlock services
answered Mar 03 '13 at 02:47 PM
iPhone 4 is unique interesting hardware by Apple because of its design and features. iPhone 4 is a solid performing hardware as usual with any apple product. This due to its slick design, feature, compatibility and newer product in the tech market. Here's a link for further explanation http://www.techyv.com/article/iphone-4-product-information-and-unlock-its-features-article
Hope this helps!
answered Sep 24 '12 at 09:25 AM