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我感到惊讶的是，Meta 大部分产品的粘性都围绕着一个核心理念：本质上，没有一个等同于“短信”（由所有电话/电信数据套餐提供）但基于数据的服务？我知道有 Signal、Viber、WhatsApp 等，但所有这些服务都需要你向服务提供商注册，而无法从使用电信公司 Z 的用户 A 向使用电信公司 Y 的用户 B 发送基于数据的消息。以前有过相关标准吗？对于它为何没有出现，有什么想法吗？

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I find it surprising how the stickiness of most of Meta's products revolve around the idea that, in essence, there is no equivalent "SMS" (provided by all telephony / telecommunications data plans) but over data ? I know there's Signal, Viber, WhatsApp etc, but all these services require you to register with the service provider rather than being able to send a data based message from User A with Telco Z to User B with Telco Y.<p>Has there been standards before? Any thoughts on why it hasn't emerged?

为什么没有一个通用的、标准的类似VoIP/数据短信的消息协议呢？