when you find a iPhone in a used car what you buy what can I do?

Do the honest thing.

The phone may be displaying information on how to contact the owner. If so, follow the owner's directions.

Otherwise, if you bought the car in a private sale, contact the person from whom you bought the iPhone, and return their phone to them. If you bought it from a dealer, take the phone to the dealer, tell them how and where you found it, and see if they can return the phone to its owner. Or turn it in to the Lost + Found department at a police station.

If you cannot find the owner, or someone who might be able to help return it to the owner, then recycle the phone in a responsible manner. An Activation Locked iPhone is – by design – a brick.

kingslum242 Said:

"when you find a iPhone in a used car what you buy what can I do?"

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Troubleshooting a Found Device:

Be honest about this. Hand this over to the person you purchased the car from. If that is not an option, then hand it in to local authorities.

If there is no realistic way of finding the owner – or of turning it in to some place where the owner might look – then it is what it is. The phone will not be reunited with its owner. Such is life.

It will also never work for anyone ever again. We cannot help you remove the Activation Lock. Apple will not help you to remove it. The only things you can do with that iPhone are along the lines of

• Using it as a paperweight,
• Throwing it away, or
• Recycling it responsibly

I take it that by "co-part", you mean a co-partner who is also in the used car business?

Presumably your business keeps records of used car purchases it makes. If you bought the used car from another used car dealer, that business should be keeping records, too – and their records might identify the individual who sold them the car. So you might want to ask your co-part(ner) to help you find the phone's owner.