“Sent as SMS” on Android means your message couldn’t go out as a data-based text (like RCS) and the phone automatically fell back to the cellular Short Message Service. If you see it when texting, the message still sends successfully, but it may not include the richer features you’d get with RCS—such as read receipts...
“Sent as SMS via server” on Android means your carrier’s messaging backend is sending the text through a server rather than routing it directly through the phone’s own SMS stack. If you see it, the message is still a normal SMS that can incur standard carrier SMS charges, not an internet-based chat message. You’re effectively...
Does sent as SMS on Android mean you’ve been blocked? Usually, it does not—“Sent as SMS” typically means your carrier couldn’t deliver an iMessage/RCS-style message and the phone fell back to a plain text instead. You should treat it as a warning sign only if SMS delivery reports fail consistently or the same contact never...