Why do people send me text messages and I can't get them?

According to the description of the situation, there are two situations:

First, the mobile phone has security software to intercept sending short messages, find and modify this kind of software, or try another mobile phone.

second, eliminate the problem of mobile phone, which means that your mobile phone sends too many short messages, and it is judged by the system to send spam messages, and it is closed for sending. Call customer service or bring a mobile phone card to the business hall, explain after the demonstration, and the customer service will contact the background data to find out and solve it.

if it is helpful, please adopt a satisfactory answer.