3 best thing to do with your old cell phone? Donate it? Sell it? Re-use it for parts? Choose one

If your phone does not have any resale value, you might enjoy taking your smartphone apart to see how it all works (in a very crude and functional way...oh! this is the RAM...oh! this is the gyroscope chip...and this is the WiFi receiver). This is especially fun if you have kids (or are a kid, physically or mentally), and doing it on an old phone will give you the confidence to switch out individual parts on your new phone if they fail. Which is better: an Android or a Windows phone? 

I recently took apart my old Samsung Captivate (the last phone with a physical retractable keyboard that Samsung made) and now I am obsessed with tear downs. The question is these What is the best thing to do with your old cell phone? Donate it? Sell it? Re-use it for parts? read: What is the best decision for Android, iOS, and Windows Phones 

3 best thing to do with your old cell phone? Donate it? Sell it? Re-use it for parts?

1. Donate it in the sense : give it to company as electronic waste or Donate to someone. Both the options are best and top of the list.
2. Sell it: It depends what mobile brand and how long it has been used. You don't want to give a mobile which looks good, awesome spec but battery is almost gone. But if it is iPhone or battery is still good. then yes you can opt for this option.
3.  Re-use : how do you re-use yourself? as electronic waste you can give back to companies. there is lot of valuable elements in there.hope this helps.