What's wrong with Apple's SMS?

Take iPhone11IOS13 as an example. The reasons why Apple's mobile phone messages are not received are as follows:

1. When the local base station makes delivery or closes the site, it will be unable to receive voice and SMS. In this case, it is best to wait until the base station is replaced. But in this case, the delivery time is generally not very long, from tens of minutes to several hours or even longer.

2. It is local mobile and China Unicom that restrict the network traffic and time and block the content. In fact, this is the reason in most cases. Because the sales policies of mobile companies and China Unicom are different, the billing and settlement are very different.

3. Excluding the factors of mobile phone shutdown or extended downtime, you can check whether the mobile phone card is blocked by the operator, because there is a speed limit for mobile companies to send text messages at present. If more than 100 SMS messages are identified as SMS advertisements within an hour, the number will be blocked. Poor regional signal or mobile phone quality problems can also lead to the failure to receive short messages. Nowadays, many smart phones also have the function of blocking strange short messages.