You can sell those old phones................
I either handed them down to extended family members or in the past several upgrade cycles I trade them in on the AT&T Next program. The older ones may be worth something, but they no longer belong to me. They belong to my kids or grandkids. If they want to sell them, they are welcome to do so. I don't need the money and the hassle isn't worth it to put them on eBay.
Thanks for the advice, though.