Are old Iphones still usable?

Basically I had an old iphone that broke and got a new one, but after a while my friend tried charging it and it ended up working. He asked if he could use it as just an ipod to listen to music and i told him sure. Does this mean that the iphone can now not be used to make calls or texts or anything since i have the new one or is it still possible for him to figure out how to use it for those purposes cause i don't want that to happen.

If it works fine, it's usable.

Well, you can sell it. Depending on the memory/storage, generation, and condition, there are places that will send you a box to send the phone in and prepaid shipping. You send in your phone, and they send you a check. Watch out for Cash for Laptops. It tells you a pretty good price but then they call you and say since of a tiny incident, and mark off half the price. I'd say gazelle.com and newtonshead.com compare prices and you choose. Hope this helps!

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