because Nokia currently listed in mainland China? Lumia? 152? The mobile phone is Unicom custom machine, so the operator's LOGO will be displayed when it is turned on? Which cannot be cancelled or deleted; The so-called custom machine is that China Unicom cooperates with mobile phone manufacturers to customize a batch of mobile phones, which are loaded with some fixed contents or settings of operators, and the basic telephone functions of their mobile phones will not change much. Generally, custom machine will impose restrictions on other operators, blocking the networks of China Mobile and China Telecom.

custom machine generally has the following characteristics:

1. There is a "WO" sign on the appearance of the machine, because custom machine is 3G, so it is this sign;

2. The on-off screen is related to China Unicom;

3. There are some shortcut softwares and shortcuts. For example, for Unicom's "116114" service, ordinary mobile phones need to dial these numeric keys themselves and then dial out. custom machine generally has shortcut keys for this service.