Automatically reply to SMS without signal.

First, you send a peer-to-peer message and the other party's mobile phone is turned off. Under normal circumstances, if the other party's mobile phone is turned on within 48 hours after you send a message, you can receive your message. Because the mobile communication system temporarily only keeps information within 48 hours. Second, so, if the phone is turned on after 48 hours, the other party will not receive the short message you sent. Third, after you successfully send a short message, your mobile phone stops, so it doesn't affect the other party to receive the short message, that is, it determines whether the other party can receive it. At this time, it has nothing to do with the state of your mobile phone, but the network transmission and communication system settings. Fourth, in fact, no communication system can be 100% error-free, and packet loss also exists. For example, when you send a text message, the network signal is not very good, or the channel is busy, or the A port transmission error, and so on. , which may result in packet loss. This situation exists, but the probability is very small. The above answers are for your reference.