Why doesn't Unicom use SMS to charge the phone bill?

Generally, after using Unicom recharge card to recharge successfully, you will receive SMS prompts of successful recharge and recharge amount. I suggest you check whether other short messages can be sent and received normally. A busy system may also lead to a similar situation. You can log in to Unicom's online business hall/click phone bill > phone bill query > payment record to check the payment situation in the past six months; Or contact the local manual customer service for inquiry.