Lost iPhone, Should I Return?

Wow I can't believe my original question got deleted but anyway.
A few things going on here, so my Grandpa bought a lost iPhone 4 (New Condition) for 40 dollars off some guy. So technically the iPhone 4 is still lost because the owner didn't sell him it, some random guy did. So he brought it home, and I unlocked it seeing that his facebook was still logged in. I could post a status on his FB asking who's phone this is and how I can contact him. So i don't know what to do because I know its haram to steal, so I wanna give it back. But my mom won't let me because my grandpa already paid and he wants to send it to his relatives in a foreign country.
To understand this, think of it like this. An iPhone 4 for free to our family is like the biggest diamond in the world.
So what do I do, even if my mom doesn't want me to return it?

Just return it. But if its that serious to your family keep it. Whoever lost it should be more careful. If I found an iPhone I in particular would not return it!

Yes you should… Tell your mom and grandpa to ask the Imam about this issue… Surely the Imam will say to return…

Yeah return it

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