Is there a third-party SMS provider besides the three major operators in Chongqing?

Our third-party suppliers have no geographical location, and generally can do business all over the country, and the arrival speed is very fast. Now SMS service providers are all third parties, but only three major operators need to provide SMS interfaces, which is a cooperative relationship. An after-sales SMS service provider should first look at the company's qualification, whether it has a formal business license and the telecom value-added service qualification issued by the Ministry of Industry and Information Technology, and the company's scale and reputation.