The number of short messages sent by China UnionPay Express exceeds the unit time limit.

What you want to ask is "What is the reason why the number of short messages sent by China UnionPay Express exceeds the upper limit of unit time?" This question? The reason is that the mailbox is full, hardware factors and signal problems.

1. The mailbox is full: First, you can check whether the mailbox is full. If so, please delete some information to free up space.

2. Hardware factor: If you still can't receive the short message after deleting the message, you can consider replacing your mobile phone or SIM card for testing to eliminate hardware factors.

3. Signal problem: If both reasons are ruled out, you can try to test whether you can receive SMS in other places. Sometimes the weak signal may lead to the problem of not receiving short messages.