Why is the callback number of the number that just received the text message empty?

This number is generally processed by software. So most of them are empty! Its purpose is mostly to cheat. (such as winning prizes, making money, changing bank card passwords, cheating phone bills, etc. ) Be careful!

Don't trust those strange information easily. Those scammers can even make up the phone numbers of your relatives and friends to cheat you. Be careful at this time. If in doubt, you'd better call to check! Avoid being fooled! You did the right thing.

This should be a kind of VoIP. The number of the VoIP phone is a virtual number, and there is no such number in the callback, so the other party cannot receive the callback.

Internet phone, also known as VOIP phone, is a direct call to the other party's fixed phone and mobile phone through the Internet, including domestic and international long-distance calls. The tariff is 65438+ 00% to 20% of the traditional phone bill. Macroscopically, it can be divided into software mobile phones and hardware mobile phones.

Software phone is to download software from a computer, then buy a network phone card, and then talk to the other party (fixed line or mobile phone) through headphones; Hardware telephone is more suitable for companies, telephone bars and so on. First, you need a voice gateway. One side of the gateway is connected to the router, and the other side is connected to the ordinary telephone, and then the ordinary telephone can be freely called out directly through the network.

VoIP is to digitize the voice signal, compress, encode and package it, transmit it through the network, and then decompress it to restore the digital signal to sound for the other party to hear.