What is the difference between SMS sending gateway and card issuing gateway?

Short message group sending is a technical word of short message group sending, including card sending and gateway. Card issuing is to connect a specific device (short message cat) and a computer with the SIM card of a mobile phone, and send it in groups through software. The message received by the other party's mobile phone is a short message from a strange mobile phone number. The gateway is directly connected to the operator, and the telecom is distributed through the network port of the operator server. The other party's mobile phone receives a specific number, such as 106 ... or the number at the beginning of the area code. Like 020.