So, when you send or receive an SMS, it gets stored in a database on your device. Yep, you read that right - a database! It's like a super-organized filing system that keeps all your messages in check. The database is usually stored in the +/data/data/com.android.providers.telephony/databases directory, but don't worry if that sounds like gibberish - just know it's where the SMS magic happens.
From the moment you open your messaging app, the MMSS (Multimedia Messaging Service) kicks in, handling all the behind-the-scenes work. It's like having a personal assistant, sorting out all your messages and keeping them tidy. You can even use third-party apps to manage your SMS storage, giving you more control over your messaging world.