@team06 Here's one way to check that the device is unmodified and from a reputable manufacturer:
# Open the Play Store app. If you need to, you can sign in using a throwaway account (Don't sign in with a Google account you use for important things)
# Once you go through the process of setting up the Play Store, select your profile in the top right corner
# Select "About" and look what it says under "Play Protect Certifocation". If it says "Device is certified", you're good. If it says "Device is not certified", the phone is fake or has been modified.