 SHENZHEN, China, Aug. 31, 2021 GLOBE NEWSWIRE -- Aurora Mobile Limited NASDAQ: JG Aurora Mobile or the Company, a leading mobile developer service provider in China, today announced that it has officially launched a free public cloud version of its Unification Messages System JG UMS. Mobile developers can use this free version as a trial of JG UMSs integrated multi-channel messaging services upon registering for an account on the Companys official website. 