How do you sell a cell phone?

[Bateluer]

I believe his implication is you then had to pay a large bill (lets assume $50 on the cheap end) for the next 24 months.

Do the math and you're about $800 in the hole.

However the logical person would realize that you probably signed that contract knowing you wouldn't change carriers for 2 years or more, leaving that cost out of the equation, as you would have had to pay it either way.

This. Thats how subsidized pricing works.

Swappa.com is also a good place to buy/sell mobile phones.