What's wrong with the limited sending time of SMS?

1, signal problem: The most common reasons for the failure of sending short messages on mobile phones are lack of signal, unstable signal and failure. Although there seems to be a signal, because the signal is in a fluctuating state, there will be a prompt that the transmission failed.

2. Mobile phone system problems: When the mobile phone system detects the mobile phone signal, based on the fluctuation of the signal, there will be problems when the mobile phone calls related functions.

3. Number problem: It is said that the text message cannot be sent out because of the number problem. Take some common numbers starting with "100" as an example. The other party can send a short message to himself, but when replying to "TD", the message of sending failure will appear. This is because the number and equipment used by the other party cannot receive short messages at all, and it can also be understood that the other party does not want to receive short messages.