China Mobile IoT Card Capability Open Platform API
The 物联卡能力开放平台 (IoT Card Capability Open Platform) exposes cellular M2M SIM lifecycle and subscriber-information operations to enterprise IoT customers. Interface documentation is published openly — the confirmed CMIOT_API2003 码号信息查询 (code/number information query) page documents GET/POST https://api.iot.10086.cn/v2/cardinfo, which resolves any one of ICCID, IMSI or MSISDN into the other two. Authentication is a proprietary signed-request scheme (appid, transid, ebid and a SHA-256 token derived from appid+password+transid) whose credentials China Mobile issues by email to approved enterprise IoT-card customers only. No OpenAPI is published.