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https://www.mdsmedia.co.in/blog/wp-content/uploads/2026/07/Untitled-design-2026-07-21T123520.605.png1024683Flash SMS, sometimes called “class 0” SMS, is a special type of text message that appears directly on a recipient’s phone screen instantly, without being saved to the regular inbox. Unlike standard SMS, which requires the user to open their messaging app to read it, flash SMS pops up immediately as an on-screen alert and...