4是什么短信平台 时间紧迫，求即刻回复！

4一般指的是由工信部统一管理的全国范围内使用的短消息类服务接入代码，是一个短信平台/通道，主要用于跨省或全国范围内非经营性短消息类服务（即不涉及费用、不涉及商业利益的短消息服务）的第三方接入。这类短信通常包括但不限于验证码短信、系统通知短信等。

In English:

4 generally refers to a nationwide short message service access code managed uniformly by the Ministry of Industry and Information Technology of China. It is a short message platform/channel primarily used for third-party access to non-commercial short message services (i.e., short message services that do not involve fees or commercial interests) across provinces or nationwide. These types of short messages typically include, but are not limited to, verification code messages, system notification messages, and so on.

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