My husband receives 500 text messages a day.

10658 1 12 starts with the numbers of "China Mobile" and "(voice mail service function) as long as the mobile phone supports" and "message" functions, when the card status (startup, card insertion, etc. ) changes, a short message will be sent to the mobile phone asking whether this function has been enabled on the current SIM card. So even if this function is not turned on on the mobile phone, it can be seen in the SMS bill.

The "reply and message" function of mobile customer service is to inquire whether the currently used SIM card has opened related services and whether there are new voice messages. It does not involve user's private information, and it is free, so you can use it with confidence.