Contract machines generally refer to legal mobile phone models customized by communication operators (such as China Mobile, China Unicom and China Telecom). ) cooperate with mobile phone manufacturers. The user must sign a contract with the designated operator to use the mobile phone and pay the rental fee in one lump sum.

Despite these limitations, contract machines still have many advantages over bare machines. The supply of bare metal in the market is not guaranteed, and the contract machine must be licensed. After signing the contract, you don't have to pay or pay the phone bill for a long time. In fact, users spend less money on the mobile phone itself.

The common and popular contract machines are IPhone 6s, iPhone 6s Plus, iPhone 6, IPhone 6 Plus, IPhone5, IPhone 5S, Xiaomi 4 and Samsung Note 4.

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Disadvantages of contract machine

1. You must sign a two-year contract with China Mobile Unicom, and promise to have a minimum consumption every month for these two years. The better the mobile phone, the higher the minimum monthly consumption.

2. During the contract period (usually two years), the mobile phone card you use for the contract machine can't be turned off or stopped. Even if you don't use it, you will be deducted the minimum consumption every month. Because it is from real-name registration system, if you lose this card and the contract does not expire, the minimum monthly consumption will be accumulated on your personal credit.

3, contract machines generally need to customize a lot of unnecessary software, and these software can not be deleted without root phone. Mobile phones are very powerful, both dual-core and quad-core, and the software customized by contract machines is generally not large, which will not have much impact on the speed of mobile phones.

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