To keep iMessages private, use strong device security (Face ID/passcode), turn off message previews on the lock screen, manage iCloud sync, and consider Advanced Data Protection; iMessage itself uses end-to-end encryption, but device access and cloud backups are key security points, according to Apple Support, Reddit users, and Buddy Infotech.
Keep Your iPhone Text Messages Private With These Tips
How to Hide Messages on iPhone?
Use iMessage Effects
Using an iMessage effect will cause your number to appear as all zeros to the recipient. They'll still see your name if you're in their contacts.
iCloud exploitation
Your iCloud account is a gateway to all your synced data, including text messages. Someone can spy on your messages by: Logging into your iCloud account from another device to view message backups. Using a shared Apple ID (common in families) to receive your iMessages on their device.
Here's how to do it: Open the Settings app. Tap Notifications > Messages > Show Previews. Select Never or Off to turn off message previews.
Stop sharing your name and photo
Choose Messages > Settings, then click General. Deselect the Share Name and Photo option.
Touch and Hold the Chat (iPhone): Open the Messages app, press and hold the conversation with the person, then select Hide Alerts from the options.
There's no way to actually hide text messages. The best you can do is long-hold the Messages app, then tap “Require Face ID” in the resulting pop-up. This will ensure no one enters the app except you.
Learn how to create an iMessage profile with a custom photo and display name in the Messages app on your iPhone, iPad, or Mac. You can create an iMessage profile in the Messages app that includes a custom photo and display name. The name and profile picture you set is visible to people you message on iMessage.
But the instructions should be similar regardless of the model of your Android phone.
Check the Recycle Bin in Messages. Check the Archived section in Google Messages. Recover messages from Google backup. Check if Google Backup is turned on under Settings > System > Backup.
Go to the Settings app on your iPhone. Tap Apps, then tap Messages. Turn on iMessage.
Your wife could see your text messages in a few ways. If your iCloud syncs automatically, or you have backups enabled, your messages might display on other devices that she can access. She might have installed monitoring apps on your phone, or simply be using a shared phone.
In iOS 16 and later, deleted messages stay in a Recently Deleted folder for 40 days before being permanently erased. Someone might delete a chat to remove it from view but still keep it in that folder. Another way people hide messages on iPhone is by using the Invisible Ink feature in iMessage.