Hi,
If the dispute had been found in buyer's favour i.e. eBay say you were at fault, then the buyer would have been required to return the item to you, via trackable method and at their own expense before a refund was given.
In this instance, eBay have said you aren't responsible and hence you have lost no money - eBay has. Therefore buyer isn't required to return and can do what they like with the phone.
In other instances, if a buyer contacts seller and says something is damaged then most will ask for a photo as proof and if the item is not resaleable/repairable will just refund without asking the buyer to return.

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