Buying an iphone without proof of purchase??

you need to purchase from an Apple authorized reseller. A majority of on-line sellers are not authorized resellers so if you buy an iOS device from Amazon.com for instance you are not the original owner and your warranty began with original purchaser (who is also the technical owner) bought or obtained the device from Apple, so if you "buy" a phone that a reseller bought over a year ago you are buying one that has no warranty any longer, even if it was shipped in a new box wrapped in plastic and never opened.

Call l1-800-MY-APPLE in North America or go to apple.com/contact for a list of international phone numbers to find an Apple reseller near you.

Hi

Be very careful do not buy an unwanted upgrade if the seller stops payments

On contract iPhone will be blocked.

Go to Safari - Apple reconditioned iPhones you will get a 12 months warranty.

Cheers

Brian 🇬-1F1E7;

If you are buying a used phone there is no sure way to avoid future problems.

The seller may subsequently report it as lost or stolen.

Assuming you have no problem activating it with your Apple ID you can use the phone but it does not mean there are no future risks either in terms of what may happen after a software update or a possible carrier blacklisting.