as we know that it is NOT everyone is able to afford a new iPhone, so buying a used one can be their only option to get one.
In this article you can find the most important tips related to the purchase of second hand iPhone/ipad.This will help you to protect yourself from scams and avoid regrets .
Make sure that the IMEI number is consistent, Check Activation lock iCloud lock status to be sure the phone has not been reported as lost/stolen, Check if the iPhone is unlocked and can be used with your carrier.
Iphone IMEI check is your main tool against scam. So you need to find all places where the IMEI number must be printed, this will help you to identify real Apple device and avoid fake.
Here are possible places where you can locate IMEI numbers, tap Settings > General > About
2-Dial *#06# to display the IMEI number
3- Barcode label on the original Apple packaging
 Engraved IMEI on the back case – only iPhone 5, 5C, 5S, 6, 6 Plus 5 – Sim tray – iPhone 3G, 3GS, 4, 4S, 6s, 6s Plus.
After you verify IMEI number consistency, use iPhone IMEI checker to get infomation about the phone
Some scammers try to sell iPhone 6 as iPhone 6s or iPhone 5 as iPhone 5s,that’s why you have to check to be protected from this type of fraud. In addition pay attention to color and memory check results. If iPhone color is not the same as imei checker result shows, it could be that the seller is trying to sell you a refurbished iPhone
Use imei checker to show if the iPhone is covered for eligible hardware repairs and service, a Warranty expiration date is available as well.
all used iPhones have ever been activated. This means that if the seller has claimed the phone as new and never used, iPhone IMEI checker will reveal the status,
Activation lock or icloud helps to keep Apple devices secure and protect it from being stolen. So if you buy an iPhone which has FIND MY PHONE turned on? you probably have bought an iphone or ipad that has ACTIVE ICLOUD. Make sue the seller turn the FIND MY PHONE off
YOU CAN NOT TURN[ FINE MY PHONE] OFF WITHOUT THE PASSWOD USED TO ACTIVATE IT
The feature called Activation lock is enabled automatically when Find My iPhone is turned on and the phone is for any reason reset or restored , thus you wouldnt be able to activate and use the iphone or ipad untill you enter the correct credentials used to activate the ICLOUD
Verify that Find my iPhone is OFF. And if IMEI checker shows “Find my iPhone status: ON”, DO NOT BUY this iPhone.
Make sure the phone is not blacklisted Before purchasing a second hand iPhone, make sure it has not been reported as LOST or STOLEN. In case the phone has been blacklisted and added to international black list, it won’t work with most mobile operators.
Make sure the iPhone will work on your mobile operator Initially the iPhone can be locked to a specific carrier. For example it can be AT&T or Sprint network etc. That’s why you should verify that the phone can be used in your country and with your operator.
The easiest way is buying factory unlocked iPhone, which can be used with any carrier. If you are not sure, that the phone is factory unlocked, check simlock status with free or paid checker and find out what carrier it is locked to .