What Unicom pits have you experienced? Which of the three major operators do you like best?

Dear users, at 0: 30 on May 6th, due to the system upgrade, some users of China Unicom had abnormal telephone charges, and we deeply apologize for the inconvenience caused to you. Our company will deal with the problem quickly after finding it, and return all the abnormal deductions in the original way before 16:00 on the same day. If you have any questions, please contact 100 15-6, which will be handled by the special moderator.