It sounds like your phone might have been pranked! If your lock screen was replaced with a funny selfie of your teachers, it’s likely someone had a bit of fun while your phone was away from you. Here’s what you can do:
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Change your lock screen back: Go into your phone’s settings to change the wallpaper back to something you prefer.
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Check your security settings: If your phone was taken without your permission, consider setting a stronger password or biometric lock to prevent future pranks.
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Talk to your teachers: If you’re comfortable, you could mention it to your teachers to see if they were involved in the prank. They might find it funny, too!
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Join in on the laughter: If it was all in good fun, maybe you can share a laugh with your classmates about it!
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Be cautious of your phone in the future: Keep it secured or close to you to avoid similar situations.
If you need help changing your wallpaper, let me know what kind of phone you have, and I can guide you through the steps!