为什么没有一个通用的标准VoIP/数据短信协议呢？
我发现大多数Meta产品的粘性令人惊讶，主要围绕着这样一个观点：本质上，没有等同于“短信”的服务（由所有电信/通信数据计划提供），而是通过数据传输？我知道有Signal、Viber、WhatsApp等，但这些服务都需要用户向服务提供商注册，而不是能够让用户A通过电信公司Z向用户B通过电信公司Y发送基于数据的消息。
之前有没有相关的标准？你对此有什么看法，为什么这种标准没有出现？
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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?