What is the number of times of Unicom's short message random code that day?

If the number of times of using the SMS random code is not limited when inquiring the phone bill, the effective duration of the SMS random code is five minutes; Effective duration of one-time SMS random code authentication: half an hour. That is, after passing the short message random code authentication once, there is no need to re-authenticate the "call list" and "short message multimedia message list" within half an hour.