Sometimes iPhone text messages disappear from the inbox after an iOS software update or after a restart, but there are also cases that text messages just disappear from iPhone suddenly. If you have made backups for your iPhone before, you can always recover lost iPhone messages by restoring from iPhone backup files.
Why do old text messages disappear on iPhone?
If you’re asking about why some messages disappear after being in your inbox for quite some time, this may be due to your Message History being automatically deleted. To check if your messages are automatically deleted, go to Settings > Scroll down to Messages > Scroll down to Message History.
Why did my older text messages disappear?
Why do my text messages disappear on Android? There a number of reasons that may cause the issue. It can be an accidental deletion or loss, recent app updates that affect your text messages, date and time setting in your phone is not updated, Android system or app version that needs an update, and many others.