Apple 4s6. 1.3 can send and receive SMS normally after jailbreak, but it can't receive SMS from overdraft card.

Generally speaking, if the software interface is successful, short messages from the software to the switch processing center (China Mobile, China Unicom, China Telecom, China Netcom) will be handled correctly. At this time, the sent messages are queued in the buffer pool and then sent to the user's mobile phone one by one through the base station. Because voice and short messages are handled in different ways, when the queue is blocked and busy, sometimes short messages are not received.

1. When the local base station delivers or closes the station, voice and SMS will not be received at this time. 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 the local mobile and China Unicom that limit the network traffic and time and block the content. Please pay special attention to this. 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. Rule out the factors of mobile phone shutdown or extended downtime, and then check whether your mobile phone card will be blocked by operators such as China Mobile or China Unicom, 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.