Sell your Old Cellphone

I am planning to do my Spring  cleaning as soon as the weather  warms up.  Right now, we are still having  snow.   YES, snow in Spring, arrrghhh.  My daughter and I are segregating the   things that they don't really need anymore and would love to get rid of.  We are planning to have a garage sale this  Spring or in Summer because.    I have some  gadgets here that  I'd love to get rid of but don't know if it's safe so I did some digging online and found a great place  that teaches you how to sell cell phones and other  gadgets.    So you see, I am not that tech savvy  kind of gal so I have no idea of the proper ways to  dispose electronic gadgets.  

Did you know that you can get up to $500 worth for your old cellphone?  Of course, it all depends on  what kind o cellphone you have.  You can upgrade your gadget by selling your old one, how cool is that!  I was just thinking that last year, my husband got me a Samsung Galaxy phone and  in just a matter of months, there are upgrades  on that said phone already.  So mine is outdated now lol.  Oh well, it does not mater to me, what maters most is that I can use it for my basic needs.