Sorry that happened to your niece. But that does not mean everybody on here is a scammer or thief. I agree there are bad people out there who don't care who they hurt to make a buck. With that said it is a public selling site and buyers should always ask questions and make sure the item is what the seller described and especially with phones or apple watches make the seller call and prove the item is unlocked from their account. And if th seller doesn't answer the questions or says they can't provide you with proof the phone is truly unlocked they are probably up to no good. I'm not making excuses for the seller who ripped off your niece. Just got to be aware your not dealing with a retail store so its up to you to be alert. You have to check stuff out b4 handing over the money. I wish you and your niece well and am truly sorry for your experience.
Thank you for reaching out and letting us know about what happened. We take these matters seriously as this is never the type of experience we want our users to have. I’m really sorry to hear about your situation. The best way to bring this to our attention is to report the user directly from their profile page or the message thread. If your niece is not able to report, please Private Message me with the email address associated to your niece's account and I can have our team investigate.
We don’t disclose actions taken on other users per our privacy policies, but I can assure you that we do not tolerate behavior that violates our Community Standards.
To prevent something like this happening in the future, please see our Best Practices for Buying items in our Help Center. Keep in mind that all items are sold in their current condition and all sales are final.
If you do end up working with local law enforcement or legal counsel on this issue, please have them contact OfferUp directly. Our Law Enforcement Resources Page will give you more details about how we work with them. Please let me know how else I can help! We're here for you!