[Qlova]

I haven't had experience of it myself with phones, but I have heard people refunding iPhones and then later they get blocked and are therefore useless.

I did refund an amazon echo plus and they did exactly that straight away and after I sold it on ebay, the buyer had to return it as it was giving him an error code, which I later found out meant lost/stolen item.

Be wary as items such as phones can easily be tracked. Maybe try it with expensive popular headphones or other electrical accessories?