The reporter learned that, the iPhone contract plan of Harbin Mobile mainly targets new subscribers. It attracts the iPhone users who have already purchased the handsets to be connected to the network through subsidy, and it is temporarily not open to old users. In September 2010, China Unicom began to sell the iPhone 4 contract plan, and subsequently many branches of China Mobile also launched the mobile version of the iPhone 4 contract plan, which triggered a war of words between both parties. Meanwhile, due to insufficient supply of iPhone 4 in the market, a large number of Mobile users who bought the iPhone contract plan from Unicom brought their machines into China Mobile network because they were unwilling to change their numbers for some reasons. Subsequently, China Unicom launched the card comparison policy, that is, the card number obtained when participating in the Unicom contract plan must be bound and used with the iPhone. If they are separated for a long time, Unicom will lock the iPhone.