Why can a mobile phone send a text message, but it can't receive it?

1: SIM card is damaged and replaced; ?

2. Set the number of the short message center. Please consult your mobile phone service provider for the specific number of SMS center.

3. Some mobile phones have a short message firewall, which stores the short message numbers you don't want to receive in the firewall, so that some spam messages will be automatically deleted. See if your firewall is set to "reject all SMS"; ?

4. Some brands of mobile phones will store SMS in SIM card by default. Whether the short message can be stored in the SIM card depends on your service provider. Some can store 40 messages, and some can store 100 messages to see if your message is full. If they are full, you can't receive messages. Delete some unwanted messages. ?

5. Call the customer service center and ask if your SMS service is enabled. If not, please ask them to enable it for you immediately.

According to the specific types of problems, step disassembly/cause principle analysis/content expansion, etc.

The specific steps are as follows:/What is the main reason for this situation?