You may want to sell your cell phone because you have stayed with it for a long time and feel you need a change. Occasionally you may buy a phone and after sometimes you may realize that you need to sell it off and probably buy a later model. Another situation in which you may need to sell your cell phone is when you have another phone and then you are lucky enough to be given another phone for free by a friend or a relative.
The above are just some of the situations you might find yourself in which push you to sell your cell phone. There are times you may be very broke and decide to sell your cell phone if it was an expensive model and buy a cheaper one so you get some cash to move on as you organize yourself. Economic conditions are tough with a lot of layoffs and as they say desperate times calls desperate measures.