Doubt/solutions

[Anilpavgi02]

How to save SMS without getting deleted unknowingly

[Ehsank]

always sync your data with Samsung cloud then you can restore from there

[Ehsank]

2nd thing you will get in recycle bin

[Sidhabhi]

You turn off option delete old message

find messages in recycle bin(if this option is available)

take backup

[AMPK]

cloud storage and sync it regularly