What do you mean by voice and data?

Voice data usually refers to data recorded by voice and data transmitted by voice, which is what we often call sound files, such as MP3 songs and so on.

Data refers to data calls;

Data call refers to the call carrying non-real-time voice, such as SMS, MMS, fax, network SMS, etc.

Network short message is a text message transmitted through the No.7 signaling network. The size of information content is limited to 70 words (140 bytes). Network short messages are mainly sent and received end-to-end through mobile phones and between mobile phones and the Internet.

Network short message refers to the information transmission process from the mobile phone terminal to the Internet or from the Internet to the mobile phone terminal when users receive or send short messages through the Internet.