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Why did Unicom call me?

Shandong Jinan Unicom called me:

Unicom will usually call you, because your number will be shut down and will be cancelled soon. Many users will unconsciously consume the phone bill without the phone bill, and then fall into a state of downtime. Unicom customer service calls to remind the owner to recharge in time so as not to affect the use.

Also, when recommending Unicom's popular service activities, they will also call the main phone, but this is irregular.