When you receive an SMS message on your iPhone, a preview of the message content pops up on the screen, and you can choose to either view it or ignore it. While this “SMS Preview” feature may be very convenient, it could be troublesome if a friend or family member is playing with your cell phone and your private text pops up in their face!
It’s simple enough to turn this off simply go to Settings > Messages > Show Preview (Off)
then if you don’t want anyone to access your text simple go to Settings > Passcode Lock (On)
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