Ask these follow up questions:
“Is the device iCloud/Activation locked or locked to a company like T-Mobile? Or is it a pin code lock?”
Most people do not know the difference between these locks and this question can help us delineate between them.
Course of Action (AKA You can make BIG BUCKS Knowing these)
iCloud/Google locked - Not a recommended buy, probably stolen. Can ask the customer to contact apple/google and get it reset.
Company locked - We can buy the device, just assume it is financed/bad esn and buy it as such. Best to create your offer using the a DB Price list or eBay.
Pin Code Locked With iCloud ON - By far some of the best money-making phones. Simply ask the customer to pop out the sim card tray and send IMEI to you. If iCloud is ON ask “Do you know iCloud information by chance?” If they say yes Walk them through how to remove their iCloud account remotely.
Pin Code Locked With iCloud OFF - Buy that because it is money. All you need to do is Reset the device when you get home with iTunes. Download iTunes on Mac or PC.