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What does it mean that the top left corner of Apple 5 shows GDCMCC? It used to show that China was moving forward.
The display of GDCMCC in the upper left corner of Apple 5 means moving Guangdong with China, which was once the reason why China Mobile suddenly displayed GDCMCC:

Users of Guangdong Mobile found that the logo on their mobile phone signal bar became "GD? CMCC "can also be translated as" China Mobile Guangdong ".Most of the users are Apple users, which is more likely to appear when using the 2G network.

It may be caused by the recent network debugging of Guangdong Mobile.

Telecom operators distribute display information by publishing the operator's name through the network, and the user information column is changed to "GDCMCC" probably because the name identification published by the operator's network has changed.