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Where can I sign the copy of the ID card used by Unicom to access the network?
A copy of the ID card used by Unicom to access the network should be filed in the Unicom customer center, which is generally difficult to see again. You can learn the following methods when using your ID card safely:

1. Remember to endorse your ID card when sending it to others or institutions. The writing method is divided into three lines, with a blue ballpoint pen. Some strokes will cross or touch the words on your ID card, so be sure to draw a horizontal line after each line to avoid being added with other words.

Please indicate the purpose of this copy next to it. As a statement. For example, "this ID card is only used for XXXX, and other purposes are invalid" and so on.

3. Credit cards, funds, mobile phones, applications, as long as you need a copy of your ID card, and so do government forms.