I sent a text message to my friend, showing "sending failed". Could it be that my number was blocked by the other party? Others can receive my message, and I don't owe money.

First of all, briefly talk about the basic principle of mobile communication.

Whether calling or texting, the system will send paging signaling to the target user's mobile phone.

The function is to tell the other party's mobile phone "Hello, there is a phone/text message for you, ready to receive it."

Then your mobile phone sends a message back to the system saying "I'm ready, connect", and then you connect the phone or receive the message.

This is stipulated in the wireless communication system protocol, and will not be changed by the change of external software and hardware.

In other words, the software cannot change and influence the content of the agreement.

FHQ did nothing but make a phone call, and then FHQ software hung up the phone at the first time.

So you can't hear the phone ringing. The feature is that the caller hears a beep in the receiver and then says "the subscriber you dialed is busy". That's what I said above.

The message is the same as firing a musket. FHQ software cannot prevent mobile phones from receiving information. Your message has been received by the other party, but after the mobile phone receives it, the first person to see the message is not the user, but FHQ software. FHQ immediately checks whether it is sent by users on the blacklist. If so, delete it directly without prompting that there is no bell.

Your mobile phone display failure was sent to you by the network superior equipment base station controller, which is different from FHQ shielding.

The "Send Failed" prompt appears for several reasons:

1. The network is busy, and there are too many users in this community, so there are no available channel resources. For example, all text messages can't be sent out during the Chinese New Year.

The signal is too weak. When the signal is too weak or the interference is serious, it is difficult for the system to identify the content reported by your mobile phone.

3. The SMS center is not set correctly. This situation will basically not happen.

4. Group texting is blacklisted.

The reason why you failed to send is above.