How is the SMS platform built? What should I do to build such a platform?

I recommend a platform for you: enterprise short message service.

Delivery confirmation provides the status query of SMS sending to ensure the smooth development of business.

Multi-mode access, sending and receiving short messages through the Internet;

Provide API mode to send and receive short messages.

Provide multiple subaccounts

Convenient for enterprise internal management and cost control;

Sub-accounts are independent of each other to ensure the confidentiality of information between various departments of the company.

Functions of enterprise SMS:

Users who provide sub-and-mother accounts can manage SMS users themselves, while ensuring the confidentiality of messages sent between users.

Enterprises that send and receive short messages through API can call EMPPAPI interface to connect enterprise IT systems and special applications such as ERP and CRM.