According to the first-hand information in China, China Unicom is currently advertising services for jailbreaking when you buy the
According M.I.C. Gadget, the advertisement is as follows: “Support Service: Free SIM-trimming, jailbreaking, installing more than ten hot applications.”
However, with jailbreaking, China Unicom also offers free cases for your iPhone 4 with purchase, so buyers will not have to use the Apple’s case program.