Why does it say unlock something when i put my phone on the charge

Hello Hollie1220,

Thanks for choosing the Apple Support Communities. In some circumstances, your iPhone will initially need to be unlocked to connect to a charging cable or other accessories. For more info on how to charge your iPhone, please follow these steps.

Charge the iPhone battery - Apple Support

"Charge the battery

To charge iPhone, do any of the following:

• Connect iPhone to a power outlet using the charging cable (included) and an Apple USB power adapter (sold separately). See Power adapters for iPhone.
• 
• Place iPhone 8 and later face up on MagSafe Charger or MagSafe Duo Charger (connected to Apple 20W USB-C power adapter or other compatible power adapter) or on a Qi-certified charger. (MagSafe Charger, MagSafe Duo Charger, power adapters, and Qi-certified chargers are sold separately.) See MagSafe chargers and battery packs for iPhone and Qi-certified wireless chargers for iPhone.
• Note: You can also use third-party power adapters and Qi-certified chargers that are compliant with applicable country regulations and international and regional safety standards. See “Charging” in Important safety information for iPhone.
• Connect iPhone and your computer with a cable.
• Make sure your computer is turned on—if iPhone is connected to a computer that’s turned off, the battery may drain instead of charge. Look for  on the battery icon to make sure your iPhone is charging.
• Note: Don’t try to charge your iPhone by connecting it to your keyboard, unless your keyboard has a high-power USB port.

Connecting iPhone to a power outlet or placing it on a wireless charger (on supported models) can start an iCloud backup or wireless computer syncing. See Back up iPhone and Sync iPhone with your computer.

WARNING: If you suspect there may be liquid in the charging port of iPhone, don’t plug the charging cable into it. For information about exposure to liquid, and other important safety information about the battery and charging iPhone, see Important safety information for iPhone."

Cheers!