Has Unicom's SMS billing been very poor? If you don't use up the SMS package, you will be charged.

Unicom SMS billing is more accurate. You can send SMS 4 12- 100 10 to check whether there are any remaining SMS packages. In addition, if the service password is set, you can also check the SMS list through the online business hall or your own business hall to determine whether the SMS package has been used up. It should be noted that short messages are not charged according to the number of messages you send, but according to the number of bytes, which is generally 140 bytes, that is, a short message charges 70 Chinese characters.