As I have explained before, I hate waste. Wasting food, energy, getting rid of good items, means you are throwing money you worked for. It is a matter of time spent working for nothing, and also of education, the way I was raised, you had to make do with what was available.
On the other hand, I appreciate having new items to play with, like a computer or a car. As long as my item gets a new life, I am happy. According to the United States Environmental Protection Agency, only 34% of the stuff we throw away are recycled, and 11% combusted for energy. The rest, almost 55%, goes to the landfill. I want to minimize my contribution to that waste.
In the past, I have given away stuff I didn’t need to people who gratefully took it and used it. I used Freecycle, or word of mouth. I also checked paid sites to try and get a little money out of my stuff, if you know how to list your old couch of where to sell an iphone, you can get back part of the purchase price to use towards replacing the item, or paying off debt.
If you are going to throw things away, any price is good. Be sure it covers your efforts though. I tried to list a scooter once, it sold to a person who never showed up, and after a couple of attempts, I just took my losses and donated it on Freecycle.
With tech items like phones or computer, getting a buyer is much more likely, there is high demand for such objects and with a bit of research you should get a decent price out of it. You could publish you ad on a generalist site, although with a specific site, you have better exposure with customers who are here to buy that object.
In the case of cell phones, you can even sell it to one of the few websites that buys them. Shop around and compare prices, if you think it is lower than what you would get on Ebay, think about your time taking pictures, writing the ad, posting the item, the commission you will have to pay… It may be easier just to deal with a company.
You tell them the condition of the object, they offer a price, you ship and receive your payment. Easy and simple. For an iphone 4, you can currently get up to $175, pretty good if you would like to replace yours for the newest version.