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What Is SMS? Your Guide to Text Messaging Basics

Trillions of text messages are sent and received via SMS-enabled devices every day, but have you ever stopped to ask, “What is SMS, exactly?” One of the oldest forms of mobile messaging, SMS messages ...
Android Authority

What does "Sent as SMS via server" mean?

What does “Sent as SMS via server” mean? This “Sent as SMS via server” message primarily pops up on Android smartphones when the person you are about to text is no longer connected to RCS. RCS ...